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Steeda S550 Mustang IRS Subframe Bushing Support System (15-18 All)

Steeda S550 Mustang IRS Subframe Bushing Support System (15-18 All)
555 4437
$139.95
$174.95
$35.00(20%)

Product Install Instructions

These Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015-2018 Mustang GT, EcoBoost, and V6 are made from CNC machined, 6061 aluminum.

These Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015-2018 Mustang GT, EcoBoost, and V6 gives the rear end a much more solid feel with no increase in NVH at all. The Steeda IRS Sub frame bushings eliminate rear sub frame movement notorious in the 2015-2018 Mustang GT, EcoBoost, and V6. A stiffened subframe allows the car to increase traction to the rear wheels and is the first step towards eliminating wheel hop.

The Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015-2018 Mustang GT, EcoBoost, and V6 are easy to install, with basic hand tools. The Steeda IRS bushing kit also does not require any permanent modifications to the car.

Product Benefits

  • Increases traction
  • No increase in NVH
  • Easy to install
  • No permanent modifications
  • Lifetime warranty
PATENT NO.: US D784,881 S

Purchase your Steeda S550 Mustang IRS Subframe Bushing Support System for your 2015-2018 Mustang GT, EcoBoost, and V6 at Steeda Autosports today!

MPN: 555-4437
Tracks like a go kart now
On my previously stock GT non-PP i had a odd sensation while cornering that could best be described as a "rubber-band" feeling. I believe it was compliance of the subframe bushings. It was unnerving. Felt like the start of the tires breaking loose - but it wasn't. I installed the Steeda rear IRS bushing support kit and the IRS braces and the sensation went away. Much improved cornering afterward. I was inspired by the improvement so I added the Steeda springs and swaybars. Tracks like a go kart now.
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Reviewed by:  from Arkansas. on 10/13/2016
5/5
I am content with my purchase and install.
Alright, I finally got around to installing the subframe supports this morning. Took me 30-45 min. They are a breeze to install. Lowered one side of the subframe at a time (just enough to slide the spacers in) and checked the alignment afterwards. No adjustments where needed. The Verdict: PP/GT (3.73's, Torsen Diff and Pirelli Summer Tires) and 56 degrees outside. On my particular vehicle, about 80% of the wheel hop has been eliminated. I still have some (minor). It's much less dramatic and more tolerable. For only $150, I would say these supports are well with it. As I have been saying all along, I didn't expect these to be a 100% fix. My car wheel hopped so terribly that I just couldn't imagine this curing it alone. It was so bad that I avoided wheel spin all together to avoid breaking something. I am content with my purchase and install.
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Reviewed by:  from Ohio. on 4/10/2015
5/5
Thank you Steeda
Today I put mine on my PP car with one inch drop & Roush blower setup 580rwh. If I power shift in to second gear(like you meant it) it wheel hops just a bit still but not to bad. If I shift nicely with the torque band it holds great. With out the kit it shook constantly in first second & third. Nice difference with no extra noise in the cabin thank you Steeda. Heaver half shafts should help even more I would think.
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Reviewed by:  from Georgia. on 4/23/2015
5/5
Install was very simple
Just finished installing my spacers yesterday. The install was very simple (especially since I had access to a lift ). I lowered one side of the subframe at a time and it didn't take much time at all to install everything and torque everything to spec. I would say around 45min to 1 hour is average. The install video that Steeda has gives you a quick glimpse of what all you need to do in case you want to see what the process looks like. Results: Took it out for a test drive right after installing the spacers (I also installed the 800whp axles from the driveshaft shop so I'm not sure if that had any affect on my results or not?) and did ECO driving around town just to see if there are any squeaks and squeals. All of that checked out OK. I did a quick run from a roll to about 70ish and my friend made a video of it for testing purposes. The wheel hop is definitely still there but so is the improvement. I will be making a proper video soon with some better testing but from what I noticed right away it's definitely a good improvement over stock. From a roll the wheel hop was minimal but I could tell right away that the car hooked onto the ground better and faster for sure. Thanks Steeda! I will be purchasing more components soon to get rid of as much wheel hop as possible.
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Reviewed by:  from Utah. on 4/29/2015
5/5
Substantial difference
I had mine installed today the install was fairly simply the 2 piece inserts were the hardest to get fitted and required some light tapping to seat them correctly. took 30 min total. My car is also lowered on springs and sway bars and there is a substantial difference in the cars launch and i don't feel any wheel hop anymore the car also handles so much better as the rear IRS seems more planted and composed over the OEM without the inserts. Overall for the money this is one of the best upgrades anyone can do. Steeda is going to sell thousands of these kits and thanks for bringing such a great product to market for us.
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Reviewed by:  from South Carolina. on 5/14/2015
5/5
Amazing job
Sitting on Steeda sport springs and just installed the IRS supports. Yall did an amazing job with the supports. It eliminated the wheel hop. I'm highly thankful because that's was irritating. Keep up the good work.
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Reviewed by:  from Georgia. on 6/19/2015
5/5
Wheel hop has diminished, the ride is still comfortable
I had the Steeda IRS Bushings, Sway Bars, G-Trac K-Brace, Strut Tower brace, and Sport Springs installed this week! WOW!! what a difference it makes............ The wheel hop has diminished, the ride is still comfortable, and the float/roll is gone over bumps/corners. It handles extremely tight in the turns and the product quality is very high!! After just being introduced to the brand, I am becoming a Steeda fan due to the high level of quality and design! Thanks to David and TJ for all the product info and help with my purchases....
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Reviewed by:  from Ohio. on 6/30/2015
5/5
Just amazing...wheel hop is gone!
So, I'm thinking about getting the whole replacement IRS subframe from Ford Racing, and then Steeda to the rescue! This is a no brainer...1 hour and done...and wheel hop gone! I know some have said it has gotten rid of 80-90%...and that's great! So far, with a few trips to the track, its gone...for good from what I can tell. A must, no matter how you drive...take the stress off of the axles and the rear driveline...
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Reviewed by:  from Texas. on 7/3/2015
5/5
Super Easy Install
Just got these bad boys put in. Great ride and and less wheel hop. Couldn't ask for more.
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Reviewed by:  from Florida. on 8/18/2015
5/5
My confidence in the rear just went up another letter grade
Got the Steeda Rear Subframe Bushing Mounts and Vertical Links installed today. My GTPP already has the Steeda sways and springs (and front subframe G-Trac brace), all of which made a huge difference in cornering ability and trustworthiness, while losing the stock bobbing and preserving ride quality. These two new items have taken things another step forward, nicely (if not greatly) firming up the rear, reducing yet more of the rear inexactness, dispensing bumps quickly, and contributing to much improved control over uneven pavement. My confidence in the rear just went up another letter grade.
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Reviewed by:  from Georgia. on 9/6/2015
5/5
Thoroughly Impressed
Initial impressions after a few nice runs, I have no wheel hop on 1st or 2nd gear on the quick shift. I haven't done a full on burnout yet, but for spirited driving, I'm thoroughly impressed.
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Reviewed by:  from Illinois. on 9/25/2015
5/5
I am very impressed with everything
So I have about 200 miles now on the IRS bushings from Steeda and the Lund tune. I am VERY impressed with everything. The bushing inserts do their job and you can feel the car try to squat when you jump on it, but then she just hooks (or, she would if the Pirellis could grab).
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Reviewed by:  from Georgia. on 10/3/2015
5/5
Steeda's components will go a long way
The good thing with most of these Steeda components, with the exception of the bushing supports, is that they can be retained if you do the solid bushings to further stiffen the subframe and stock suspension. Obviously the bushing supports wouldn't be used with the solid bushings, but the subframe supports, toe-links, and vertical links can, and SHOULD, be retained.
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Reviewed by:  from Arizona. on 10/27/2015
5/5
Definitely less wheel hop
Just installed mine, pretty easy to install. Definitely less wheel hop but still there. What do you suggest next? Brace or links?
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Reviewed by:  from Oklahoma. on 11/17/2015
5/5
Wheel hop was reduced by about 50-75%
I had the bushing kit put on. I'd say the wheel hop was reduced by about 50-75%. I then had the rear subframe support braces put on, and the wheel hop is just about completely gone. Awesome stuff.
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Reviewed by:  from California. on 12/9/2015
5/5
I'm officially a believer!
Ok. So I know everyone has already made threads about their Steeda stuff, but I'm officially a believer! Springs Sway bars Sway bar Billet Brackets Vertical Links Toe Arms Bump steer kit G-Track Brace IRS bushings MMR Camber Plates Performance wheel alignment The car is a go kart. Set the front sway bars to the center and rear to the lower settings, entry high speed turn is predictible, so much so I haven't learned the limits yet. The ass can be easily manuvered with throttle (Race mode/traction off). The body roll seems like it's gone (once the track wheels/tires come in I'll know for sure), it's unreal, I am in LOVE with the car now. This is the way it should've come from the factory for the PP cars. Really a learning curve, since now everything is souch more compossed. The IRS bushings and arms drastically changed the feel of the car on take off, the power actually goes to the tires (which I spin even easier now, even with camber still within factory specs.) There's not that feeling like the IRS wasn't properly fastened, it feels like it's built in to the body. Such a great mod. I'm ordering the IRS brackets as well, but I don't see how it can really improve further. It that good!! Steeda has my vote!
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Reviewed by:  from Georgia. on 1/13/2016
5/5
The car is showing zero wheel hop
Been on vacation the last week but I had a chance to hit the track last night. Wasn't planning on making any passes but it was dead and the cars that were making passes were hookin' really well so I decided to make a few. Unfortunately I didn't have the laptop with me to log the passes. First pass I left soft. 2000 RPM and no 2-step. Car hooked and zero wheel spin or hop. Hooked well enough that it bogged a bit off the line. Second pass. 3000 RPM on the 2-step, no launch control just RPM mode. Car dead hooked. No spin, no hop. Again, hooked well enough to bog the car a bit. Third pass. 3200 on the 2-step, RPM mode. Again, hooked with no hop and just a bit of spin.....enough to just chirp the tires. So, that's 6 passes with the Steeda bushing supports, sub frame braces and vertical links and the car is showing ZERO wheel hop. These last 3 were what I was really looking for as the car was hooking and showing no sign of hop at all.
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Reviewed by:  from Georgia. on 1/27/2016
5/5
Honestly, the fitment is so unbelievable
Added even more STEEDA!!! IRS Brackets and Centering spacers. Lucky for me, we set the IRS properly and the centering spacers went right in, easssyyy. The brackets also went right in. I had a slight snag with the front OE bolt, WD40 did the trick. All looks unreal. Spent the day washing both my cars, so no driving impressions, but I just love the idea that everything is so fastened. Honestly, the fitment is so unbelievable, that sometimes I think Steeda help develop the car. lol.
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Reviewed by:  from Florida. on 2/10/2016
5/5
A great compliment to the performance package
First impressions, car is handling very good on michigan roads! I cannot go full out performance driving because I did paint my brake calipers as well, ended up being a little short on brake fluid after bleeding all of the air out of the lines, anyways! Overall, a great compliment to the performance package, I am very happy that they maintained a linear rate instead of the progressive rates from others. Went over a few super bumpy horrible gravel filled roads, car actually feels more comfortable for some strange and weird reason. Gave it a little gas on first gear and the car does not squat nearly as much and it does not nose dive nearly as much, swinging the steering wheel back and forth and the car does not act like its twerking anymore so that is awesome. I also installed the steeda subframe bushings as well, so maybe the two were a potent combo! Rear subframe braces are on the way so I'll give you a full Review of everything once they are all on and the car had an alignment, go pro video to come! Also, a teaser of the brakes I did myself
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Reviewed by:  from Michigan. on 2/21/2016
5/5
The car feels so much more planted to the road
This is the first time I've ever done anything suspension wise to my car, David @ Steeda helped out greatly with all my questions as well as getting me setup with an install at their Pompano location with a tour of some badass shop cars and their facility. Everyone @ Steeda - David, Patrick, Matt were great and made sure I was happy with everything. I can't recommend their shop enough to anyone in the area and Matt did an awesome job with everything on the install, even tack welded my Gibson exhaust and turned their clamps a bit to help out. I won't have a chance to do pics this weekend of my spot on the beach as that will give a good before/after comparison when I put them together. The car feels so much more planted to the road, even just turning out of their parking lot I could tell everything felt more connected and precise to what I was telling the car to do. It basically now goes where I want it instead of reacting to what I'm asking it to do if that makes any sense at all? I had some open highway and did a little bit of careful back and forth in my lane and I felt completely planted and not bouncing around back and forth in my seat. Almost found myself doing slalom in between some construction barrels but given how my morning went I decided against it. The springs give the car the look I wanted and make the Vossen wheels look that much better. Nice tighter rebound than stock PP springs and reduces the overall bouncy ness on some of those highway stretches where it feels like you're hitting hydraulics for a half a mile. Also any bridges or overpasses with rough spots where you enter/leave them were solid. The MT-82 bushing insert is noticeable and I had much easier downshifts for highway passes on the way home, feels like a much more solid shift that I had to get a bit used to in a good way. I didn't do any hard launches or try to break the rear end loose at all since I was just getting used to it, will report back later on that. I can't really report on some of the individual IRS components since they all went in at the same time, but I am noticing a slight (and I mean slight) gear wine from the rear with the Black bushings. It's only really noticeable if you try to make it happen and barely push the gas at cruising speed. Nothing I'm worried about and after 4 hours of driving it home windows down and up for a few sprinkles it does not bother at me all. It's not all the time either or in any specific gear so no biggie as far as I'm concerned.
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Reviewed by:  from Florida. on 3/27/2016
5/5
The handling of the car is just perfect
I am beyond please with everything that Jamie did for the installation and alignment. David was an absolute pleasure to deal with in buying and setting up the appointment for me. Everyone at Steeda has been a joy. The car has been completely transformed. The ride quality with the progressive springs is 3 times better vs. the stock GTPP springs. The handling of the car is just perfect. It is so, so flat now when pushing the car hard in any type of turn. Brake dive has been greatly reduced. I would say by 80-90%. I can mash the brake pedal and it just stops, so tried and true. The front-end barely dives at all. This is from 70-75mph and just mashing the pedal. It truly begs for more speed when entering turns. Of course, this only on roads and not a race track or autoX course. Wheel hop has been greatly reduced. I still have a couple more parts to order to virtually eliminate it all together and those will be ordered at a later date. Shifting hard to 2nd gear, I just now get wheel spin and no hop. Only time I get a little hop is via a hard launch. But again, it is greatly reduced and doesn't happen all the time. The car is so quiet, no increase in NVH in anyway. This has been some of the best money I have ever spent on any car mods, PERIOD. Their parts deliver what they promise and produce outstanding results. Anyone on the fence, I highly recommend you go ahead and purchase their "stuff".
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Reviewed by:  from Georgia. on 3/17/2016
5/5
I now have ZERO wheel hop!
I forgot to update this after installing the Steeda springs and wheel hop kit, I've had them on for a couple weeks now. I'm loving the look with the springs, and there is definitely a noticeable difference in handling. Ride quality suffers a little, but it's not terrible. The wheel hop kit (IRS subframe bushing support system) does exactly what it's advertised to do, I now have ZERO wheel hop!
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Reviewed by:  from Texas. on 4/2/2016
5/5
wheel hop on my car is 100% eliminated
A couple of months ago, I started looking into overhauling the suspension of my 2015 GT PP. Up to that point, I had put about 7000 miles on my Mustang which allowed me to get a good sense of the issues with the IRS and overall suspension in stock form. Specifically, I wanted to stiffen up the entire rear end and eliminate the dreaded wheel hop while keeping NVH as close to the stock levels as possible. I also decided to replace the stock PP springs and sway bars in order to improve the overall handing, reduce body roll/brake dive and get rid of the bouncy ride. After going through a ton of feedback on the various solutions from the aftermarket (a lot of which came from fellow mustang6g members), I decided to go with Steeda. Below are the parts I chose to go with. Differential Bushings (Red/Street) Subframe Alignment Kit Subframe Bushing Support Vertical Links Rear Toe Link Subframe Suport Braces Linear Sport Springs Front and Rear Sway Bars and Billet Sway Bar Mounts Bumpsteer Kit I already had the Extreme G-Trak Brace installed. Now to the most important part...the results. The handling of the car is on a whole different level after the suspension upgrades. Minimal pitch and roll during braking, turns and transitions. Overall, the entire car is very tight with much better turn in. As expected, the biggest improvement is the rear end. The power delivery through the IRS is fantastic. The wheel hop on my car is 100% eliminated. The rear tires feel as if they are glued to the ground. Coming out of corners, I am able to get on the throttle earlier and more aggressively without any drama. In terms of NVH, I hear some gear whine in 6th gear under minimal throttle between 75 and 80mph (windows closed/stereo off) as a result of the differential bushing inserts. Apart from that, I can't tell a difference compared to stock. Even the ride quality feels great. My fiancé couldn't tell that anything had been done to the car. Overall, I am very happy with the results. Props to Steeda for the excellent work they have done. In the near future, I am looking forward to adding a quality set of performance shocks/struts and hitting the road course.
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Reviewed by:  from Georgia. on 5/7/2015
5/5
I am a Steeda believer
The car is a totally different handling car. Took the wife for a ride today and she said it is smoother than before. Much less bouncy. That is good news to me. Cause if the wife is happy I am happy. But I will say that these mods have really changed my confidence in the car. I had one little 30mile spirited section with S curves on my way home that normally when they say 45mph.. you can take them at 55mph... I took them at 70mph and the car was just planted solid. No roll, no rebound and no breaking loose on the rear when I accelerated from the apex. It just transitioned smoothly and predictably. Now the only thing the wife did notice was the gear whine. Yes the Red differential bushing will cause some gear whine, but I have been told that replacing the stock gear oil in the rear end will help quiet that noise down. We will see as I will most likely change mine out here in the next week. Amsoil or Royal Purple is what a lot of people recommended. So, all in all, if someone is on the fence about these suspension upgrades, just do it. The guys at Steeda are top notch and know their stuff. Almost all of them have Mustangs and the owner even races them. A final shout out to [email protected] What a great help he was. He made sure everything was ready and there, his recommendations were spot on. David, again, Thank you man. I can hardly wait for the next batch of Steeda goodies come out.. Count me in already. I am a Steeda believer.
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Reviewed by:  from California. on 11/13/2015
5/5
Install is very easy and you don't notice any difference in ride comfort or noise
Install is very easy and you don't notice any difference in ride comfort or noise. However, while I did these the same time as Eibach Sportlines, they stand out on their own. Launch the car and you can notice a difference in deflection.
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Reviewed by:  from Indiana. on 4/30/2016
5/5
There are no reviews for this product!

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