Steeda Stage 1 Handling Package - Sport Progressive (15-17 GT/V6)

Steeda Stage 1 Handling Package - Sport Progressive (15-17 GT/V6)
555 2122 P
$649.95
$739.95
$90.00(12%)

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Steeda Billet Sway Bar Mounts Upgrade

Give your 2015-2017 Mustang the proven performance of Steeda manufactured suspension parts. This Steeda Stage 1 Handling Package - Sport Progressive for your 2015-2017 Mustang GT or V6 is designed to improve cornering grip, handling balance, reduce brake dive, and reduce body roll while maintaining exceptional ride quality.

This Steeda Stage 1 Handling Package - Sport Progressive for your 2015-2017 Mustang GT or V6 will also lower the vehicle about 1.125" in the front and 1" in the rear, for a great appearance and improved weight distribution.

Our Steeda Stage 1 Handling Package - Sport Progressive come paired with our Steeda Mustang Sport Springs - Progressive. These springs are a great daily driving spring much like our other line of Steeda Springs, and are engineered to perform exceptionally on the track. The progressive rate of the springs will increase spring rate as your Mustang's body roll increases, giving you improved corner handling at high speeds.

Our sway bars have machined steel billet sway bar ends, whereas others on the market have coined ends. What does this mean? Our sway bar ends are machined out of billet steel round stock, in-house, on our multi-axis CNC lathes and go through hundreds of computer simulations to ensure the ultimate in strength and performance - this provides greater resistance to bending stresses, and has three major advantages:

  • These parts are less prone to cracking/fatigue failure on the ends themselves.
  • It also reduces unwanted deflection in the sway bar end. Excess deflection creates unwanted geometry changes, which physically changes your sway bar stiffness to a non-ideal rate.
  • With less unwanted deflection, our bars will 'wear out' slower - any spring will eventually become softer over time as it is cycled through its life, our bars will maintain their designed rate for longer with less unwanted deflection.

Our bar rates are developed and optimized through advanced vehicle dynamic simulation and through extensive real-world testing. We engineered these bars to control the vehicles' roll stiffness properly while still allowing you to run softer springs. This optimizes your overall grip and balance of the vehicle while still allowing you to maintain exceptional ride quality.

Package Includes

  • 555-1015 - 2015-2017 Steeda Mustang Front Sway Bar
  • 555-1016 - 2015-2017 Steeda Mustang Rear Sway Bar
  • 555-8210 - 2015-2017 Steeda Mustang Sport Springs - Progressive

Product Benefits

  • Lowers your 2015-2017 Mustang GT or V6 1.125" in the front and 1" in the rear
  • Improves overall vehicle handling while maintaining exceptional ride quality
  • Reduces body roll and brake dive
  • Improved cornering grip and handling balance
  • Increase spring rate as body roll increases
  • Fits coupe and convertible

Purchase your Steeda Stage 1 Handling Package - Sport Progressive for your 2015-2017 Mustang GT or V6 at Steeda Autosports today!

MPN: 555-2122-P
It only took the drive back from the shop
Just had Steeda's progressive springs installed in my GT. It only took the drive back from the shop to realize the ride quality and handling improvements!
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Reviewed by:  from Georgia. on 1/13/2015
5/5
It's amazing
I installed my Steeda progressive springs tonight, not a bad install, took a little over 2 hours. It's amazing the difference in appereance the springs made, and even a bigger difference in handling! Just a quick pic I took when I backed it out of the shop, I'll get some better pics this weekend when it's cleaned up and the springs have settle down. Thanks David @ Steeda
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Reviewed by:  from South Carolina. on 3/19/2015
5/5
Steeda got it right
I had my progressive springs and well, many other suspension goodies installed last Friday in Valdosta and I can tell the car rides like it is on rails now. Even with the rough roads here in South Carolina I haven't come close to bottoming out or needing the bump stops. Again all I can say is Steeda got it right.
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Reviewed by:  from South Carolina. on 2/27/2015
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 4/28/2015
5/5
GTPP 5.0 - my bounce is virtually gone
I also have a nearly loaded GTPP 5.0 and my bounce is virtually gone. My wife now says the car in enjoyable to ride in. The springs and sway bars work in tandem to reduce/eliminate the bounce. I have put my car through some pretty bouncy roads and a few tight twisty roads and the thing rides like it is on rails. If there is any roll I am not feeling it and bounce, gone. The one set of railroad tracks near our home would cause the car to bounce violently. Since putting the springs and sways on, no bounce, just a smooth pass over them. And last you are right, getting the wife's approval has made the next mods easier to justify. Enjoy the ride!
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Reviewed by:  from California. on 5/11/2015
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 7/18/2015
5/5
Riding great so far, better than stock!
Finally got my Steeda progressive springs installed. Riding great so far, better than stock I would say, and the stance is sexy. Shout out to David for the help
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Reviewed by:  from Arizona. on 11/23/2015
5/5
Love them
I just installed the Steeda Progressive springs a few weeks ago and love them. The car rides so much better and even handles better. Improvement all the way around. Once you go Steeda you never go back!
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Reviewed by:  from Florida. on 1/5/2016
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
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 5/9/2016
5/5
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