Steeda Mustang GT Axle-Back Exhaust 5.0L Coyote - Aggressive Tone (2018-2021)

26 Review(s)
$75.00 (9%)
Steeda's 2018-2021 Mustang GT Axle-Back Exhaust System 555 3612 is constructed from 304-stainless steel and delivers an aggressive drone free tone.
Part Number: 555 3612

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Steeda is proud to introduce our new Axle-Back Exhaust System for the 2018+ Mustang Fastback GT that packs a punch with a mean modern note. We have designed this system to bring out the raw powerful sound your 5.0L Coyote delivers. Our exclusive axle-back exhaust design provides maximum horsepower and the best tone without annoying drone. The can style mufflers have an embossed Steeda sidewinder and some of the best looking welds in the industry. Their compact design tucks neatly under the rear valence and the tips are adjustable forward and backward to achieve perfect fitment and symmetry.

This Steeda S550 Axle-Back Exhaust System is constructed from 304-stainless steel which will not develop surface rust like 409 or rust through like aluminized steel. The tips of our Steeda axle-back exhaust are constructed from polished 304-stainless steel and are adjustable forward, backward, and rotatable to achieve perfect alignment and symmetry.

The installation of this Steeda S550 Mustang Fastback GT Axle-Back Exhaust System is a simple bolt on using common hand tools.

With the mean tone and additional volume this Steeda S550 Mustang Fastback GT Axle-Back Exhaust System gives your 2018+ Mustang GT, there is no doubt you will turn some heads driving down the road and at track. The polished exhaust tips ensure your S550 is a show-stopper even when standing still.

Product Benefits:
  • Adds aggressive mean tone
  • Great daily driving volume with no drone
  • 304 stainless construction provides lifetime of corrosion resistance
  • Up to 10 RWHP increase
  • Up to 20% weight reduction
  • 3 1/2" diameter chrome tips

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Steeda Autosports

Installation Information:

Level of Difficulty: Easy
Install Time: About 1 Hour
Tools Required: 3/8" Ratchet, 3/8" Extension, 15mm Socket, 15mm Wrench, Reciprocating saw, Jack, Jack stands, Wheel chocks, Safety glasses, Gloves
Print Instructions: Installation Instructions

Vehicle Fitment:

Fits Model Year: 2018, 2019, 2019, 2020, 2021

Customer Reviews

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Average Customer Ratings


This exhaust is amazingly sounding... Not too loud, well to me
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from McDonough on 7/24/2021
Aggressive, mean, sounds like a muscle car!! 2020 GT stock resonator
As a dad, this sounds SOOO MUCH BETTER then stock. It has a deep rumble. And surprisingly quiet at low rpm. But once you get on it the exhaust comes alive! Sound so good throughout the rpm band. I can’t imagine a resonator delete, this setup is perfect for me now. I have the stock resonator. Sounds like a muscle car should sound! Videos don’t do it justice!! Best money spent!!!
Did you find this helpful?  1 of 1 Found Helpful
from Northern New Jersey on 7/11/2021
Bring out the beast in you Pony
I paired this Steeda axle back with a previously purchased Steeda Xpipe, and wow! This is not for the faint of heart. Early morning cold start ups will wake the neighbors. After it warms it quiets down, but when you step on the go pedal, heads turn. Installation was pretty simple. I did have to adjust the hangers because the hung too low.
Did you find this helpful?  3 of 3 Found Helpful
from Batavia on 6/9/2021
Steeda Axle back
Cold starts are loud and mean when paired with a hpipe. From what I can tell, there is a tiny increase in cabin noise with this setup versus the stock setup but NO drone at all. There's a nice rumble at idle and a lot less rasp compared to the stock mufflers. It's loud when you want it and quiet when cruising. Overall I'm pleased with this setup. Hopefully, they will have more options for color and tip sizes in the future.
Did you find this helpful?  5 of 5 Found Helpful
from THOMASVILLE on 3/29/2021
Steeda Axlebacks
2019 GT 10 speed, bought Steeda Axlebacks together with a 1 7/8 Pri. Texas Speed Headers, Borla Switchfire midpipe, hi flo cats, so when i start (cold), it wakes the dead, added 2 resonators (generic) and it tamed it down just a bit. still wakes the dead. lol! Idle is mellow tone, accelerating to 40 mph, alittle coarse but acceptable, but W.O.T. is loud and Authoritive ! sounds so killer! Cruising no drone at 75 mph. i am 59 so i need something quieter. maybe a turbo muff! good product though, nice welds, 304 SS, tips too! had to cut and bend hangars to make tips look rad.
Did you find this helpful?  1 of 1 Found Helpful
from Farmington on 3/1/2021
Best on the market
I absolutely love the Steeda axle back exhaust. Mine is paired with a Ford Racing Performance x-pipe. I am a little surprised how much deeper it made my 2020 gt sound. I've always ran Flowmaster mufflers on my mustangs and trucks. But when I did my research and came across the Steeda brand, I didn't waste any time getting them. The axleback looks very high quality and is a lot cheaper than most others on the market. Nice, deep tone down low in the rpms, and really comes alive in the higher rpms. Received mine within 3 days from ordering.
Did you find this helpful?  3 of 3 Found Helpful
from Inman, SC on 1/30/2021
Should have bought this sooner!
Amazing sound!!! Videos do NOT do Justice.... especially paired with an H-pipe. Keep in mind that it’s slightly raspy up top even though it is not an x-pipe but you still retain the low growl down low. I already got compliments the day I got on when I drove it around town to break it in a little lol. Don’t be like me and debate buying it for 6 months but it now and never regret it! Also, I spray painted them black and it hold well if you use a black primer spray paint!
Did you find this helpful?  4 of 5 Found Helpful
from California on 1/15/2021
Its ok
Sits too low, also the tips should be wider. Sounds pretty good. Very loud when paired with H pipe.
Did you find this helpful?  4 of 4 Found Helpful
from Raleigh on 12/26/2020
2019 GT Convertible
I purchased the Steeda axle back exhaust and h pipe during Steeda's Black Friday sale. Both items were received 4 days later and in perfect condition. The car sounds amazing and exactly how a Mustang should. You will not regret making this purchase.
Did you find this helpful?  2 of 2 Found Helpful
from New Orleans on 12/5/2020
Stopped by and picked the Steeda axle back backs up and have them paired with the Steeda H-pipe. I love the new tone that has been added to my car.
Did you find this helpful?  1 of 1 Found Helpful
from VALDOSTA on 10/28/2020
Last week I pulled the trigger on the axle back with a h pipe.. When you drive normal it can be quiet in fact I took my 90 year old mother to the doctor in the car about a half hour ride. she didn't mind it at all. I did show her at one point how loud it can get. The point of this review is if your afraid to get because it will be too loud don't worry it only gets loud when you hit it...But when it does get loud it's the roar of the coyote Gods it sounds so good. As usual with steeda the parts are all top notch.
Did you find this helpful?  6 of 6 Found Helpful
from Amityville on 10/26/2020
The sound of these Steeda axle backs and H pipe with remaining factory piping in between sounds bad ass. Very loud cold start but mellows out. This is a loud exhaust note. At about 4grand on the tach they turn from raspy to a deep growl good sound. When out of the gas or 6 gear at 80 mph very pleasant no drone and a little more noise than stock. If you want a mean sounding 5.0 this is the way to go. Great price and very hi quality. Again the exhaust note on this setup really changes at about 4grand really deep good sound!!!
Did you find this helpful?  7 of 7 Found Helpful
from Indiana on 10/10/2020
Axle back and h-pipe
Very easy install and sounds great with your h-pipe that I had previously installed, can be pretty quite or pretty loud all depending on your foot, love the cold start bark and the rev match down shifts to scare the foriegn hotrods
Did you find this helpful?  1 of 1 Found Helpful
from mayville on 8/17/2020
Steeda axle-back
The shipping was on time with no issues. The Steeda axle-back exhaust was easy to install and it sounds great.
Did you find this helpful?  4 of 4 Found Helpful
from CHARLESTOWN on 8/7/2020
Steeda Exhaust
Really well made exhaust install was super simple. Love the sound!
Did you find this helpful?  2 of 2 Found Helpful
from Connecticut on 7/29/2020
Steeda Axel Back for 2018 Mustang GT
Love this exhaust. It sounds so good. No drone at highway speeds Just a little louder than stock at Idle but comes alive with just a little throttle. Nice and loud when I want it to be. Exactly what I wanted. The tips are thicker and nicer than OEM.
Did you find this helpful?  9 of 9 Found Helpful
from Virginia on 6/15/2020
great sound
I watched a ton of videos before pulling the trigger on this axle back. I couldn't be happier the car is drone free while cruising, and absolutely roars under full throttle. Cold starts are amazing as well. Simple to install, especially after I did the full length jacking rails. Maybe 30 minutes under the car.
Did you find this helpful?  5 of 5 Found Helpful
Verified Buyer   from Camas on 6/3/2020
Best Axle-back. Period.
Finally! After all of the trial and error of finding the right exhaust note, I found these! These axle-backs have the perfect growl when you let loose. But are also tame if you are on the highway or in a higher gear. I have these installed with an H-pipe and could not be happier. The quality is also the best that I've seen. Smiles are guaranteed! Just put these in your cart and enjoy your well deserved Mustang note!
Did you find this helpful?  11 of 11 Found Helpful
Verified Buyer   from Texas on 5/27/2020
Sounds and look great
Exhaust sounds great and also looks great as well. Nice and Loud when on the throttle, and actually quieter than stock when idle or cruising.
Did you find this helpful?  4 of 4 Found Helpful
Verified Buyer   from St. Louis, MO on 4/18/2020
Great option
I've used just about every possible muffler on one of my 30 Mustangs I've owned, but this was the first time I tried Steeda's offering. I'm VERY happy to report the quality was great as it is with their suspension parts, and I absolutely LOVE the tone ! It's louder than stock , but not too obnoxious even for this 50+ year olds daily driver, and I've already done the resonator delete. Thanks Steeda !!!
Did you find this helpful?  11 of 11 Found Helpful
Verified Buyer   from NC on 1/22/2020
Great value for money
I love the sound of this axle back. It sounds very mean and aggressive with little to no drone at cruising speed, however, fitment is a little off, the exhaust tips sit a little too low and I had to cut the hanger about 3/4 of an inch to make it fit better.
Did you find this helpful?  9 of 9 Found Helpful
Verified Buyer   from on 12/13/2019
Top Quality
Very well made, top quality. Deep sound, no drone. Great price.
Did you find this helpful?  6 of 6 Found Helpful
Verified Buyer   from Michigan on 12/10/2019
No drone
Sounds great both inside the car and outside the car, my last GT had MBRP race and had a really bad drone, Steeda isn't loud inside the car until you accelerate
Did you find this helpful?  7 of 7 Found Helpful
Verified Buyer   from ARIZONA on 12/5/2019
Sounds way better than a Rousch. Has a awesome deep tone with the Steeda H-pipe I installed also. I get tons of compliments on how mean and aggressive it sounds! I'm very pleased with sound. Absolutely no DRONE! You can't go wrong with this axle back. The cold starts make everyone turn their heads in awe.
Did you find this helpful?  17 of 17 Found Helpful
Verified Buyer   from Virginia on 6/6/2019
Steeda axle back
Such a great sound for my 18 GT. In fact, it sounds so good that I haven't even installed the steeda x pipe that I purchased at the same time in fear of changing the exhaust note. No drone what so ever. Only issue I'm having is not being able to keep my foot out of the throttle to hear em. And their so quiet at cruising speeds. Shipping was blazing fast to. Install was a breeze once i picked up a couple rhino ramps at the local. So happy I went with this axle back!
Did you find this helpful?  14 of 14 Found Helpful
Verified Buyer   from Indiana on 5/8/2019
There are no reviews for this product!

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