Roush Axle-Back Exhaust System Without Active Exhaust GT 2018-2021

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MSRP $845.99
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Roush Axle-Back Exhaust System for 2018, 2019, 2020 and 2021 GT Mustangs without the Active Exhaust Option.

Are you looking to boost your 2018-2021 GT Mustang’s stock performance and sound while also giving it a more aggressive look? Then be sure to purchase this Roush Axle-Back Exhaust System from CJ Pony Parts! 

Features and Benefits:
- Aggressive, Race-Inspired Sound and Powerful Looks
- Helps Boost Performance: Improves Flow and Reduces Back Pressure
- Made of Corrosion-Resistant T-304 Stainless Steel with Mandrel Bends for High-Performing Air Flow
- Dual High-Flow Mufflers Improve Stock Sound, Performance and Flow Characteristics
- Quad Polished 304 Stainless Steel Tips
- Fits All 2018-2021 GT Mustangs without Active Exhaust from Factory 

This Roush (422097) Axle-Back Exhaust System offers an aggressive and race-inspired sound and powerful looks while also boosting performance, and it’s designed to help improve air flow and reduce back pressure. Featuring dual high-flow mufflers and quad polished 304 stainless steel exhaust tips, this axle-back exhaust kit is designed to fit all 2018-2021 Mustang GTs that don’t have the Active Exhaust option from the factory. 

Please Note: This exhaust is for 2018-2021 models only. It will not fit 2015-2017 models regardless of installed valance. 

Tech Tip: Installation requires cutting of the factory exhaust piping. Once the modifications have been made to the factory exhaust system, installation is a simple bolt-in procedure. 

California Residents: Proposition 65 Warning

Installation Difficulty


Novice skill is required for this installation.

Installation Videos

Video Transcript

Since the Coyote Mustang was introduced, the Roush axle-back has been one of the most popular options for those owners. That option is available for the 2018 Mustang. Today, we're going to install it on this 2018 Mustang GT. The Roush axle-back is known for that aggressive race inspired sound of the previous models. And it's basically going to sound the same way on the 2018. Just like usual, high quality construction throughout, with 304 stainless steel, mandrel bent pipes, their high flow mufflers, and then a pair of quad tip stainless steel polished 304 tips. For this installation, you'll need a lift or a jack and jack stands, 3/8 ratchet, 13 millimeter socket, marker, sawzall, file, and safety glasses.

The first thing you obviously want to do is get the car up in the air. And like any other axil back, the Roush will require cutting. Now where you're going to cut, basically you're going to follow this curve until the pip gets straight. The first section of the straight part on both sides, we're going to mark and cut. And once you cut it, slide it out of the rear hanger to remove it. Once you make your cut, you want to grab a file, and just clean up this edge here. Make sure there's no excess metal sticking out, so it's easier to get the Roush pipe to slide over. Okay, now grab the Roush muffler, this side specific. We'll put a clamp over this end here. And start by putting it into the rear hanger first. Then line it up with our cut. Then we want to snug up the clamp. With the muffler installed, we're going to grab the tip, another clamp, and we'll line that up and also snug it down. Make adjustments and snug it all down tight. Repeat the process on the other side, and your installation is finished.

As you would expect from Roush performance, the fit was great. Now, lets hear how it sounds. Now obviously, that's just cold start. But that's a very familiar sound, very similar to the 2015 through 2017. Like I said, very familiar. I always love the way the Roush sounded on the previous cars that have the on Mustangs in the past. They sound great on the 2018 as well.

Obviously, we do a lot of exhaust systems here at CJ's. We know customers love them. They like to hear them, see how they install. But one question I always get is, "Which one's the best? You've heard all these exhausts. You have to have opinions."

And obviously, I do. I've had some different systems on my car that I've liked over the years. But if you want to dictate best by how popular it is, the Roush is definitely going to be up there. It's always been one of my favorites. If you don't want to get into a full cat back, and you just want to do an axil back just to get a little more growl out of the car, a little more attitude out of the car. The Roush has always been a great choice. It really does sound good without changing anything else, literally just changing it. And it's gotten to a point the system is so popular these days, that people can hear it. "Oh, that's a Roush axil back."

Like you can almost tell by the sound, because it just sounds good. It gets that nice growl to it. Really sounds good throughout the RPM band. But you hit highway speeds, and it's quiet. It makes a very good choice for something that is an easy axle back installation. Price is pretty decent on it. And it sounds really good without any other modifications. In the past, you guys know, who are subscribers to the channel, that we did the axil back in the past, and then did resonator leads on it. And in my opinion, when you add the resonator lead to the previous systems, it's almost too loud. But judging by our customers, people seem to absolutely love it. Now I'm sure at some point in time, we'll do the same thing here. We'll add a resonator lead and see how it sounds on the current model. But given this sounds very familiar, I'm sure it'll be just like the 2015 through 2017, where it gets really, really loud when you take the resonator off.

That's one of the things that makes a Roush so nice, is if you want to take it to the next step, you can. But for a lot of people, simply throwing this axil back on their car is going to be enough. It sounds great. It's simple to install. The polished stainless steel tips look good. Just a very, very simple add on to your car that you're going to be very happy with when you have it installed. With just the axil back installed, the sound is loud enough that it's gonna turn people's heads, hopefully not the police at that point. But it's loud enough for people to hear it and turn around to see exactly what's making the sound. Now that's with just the axil back. You decide to take it a step further, maybe add that Roush resonator lead, and then that's a whole new level of loud. Like I said, we'll do our best to do that video for you as well. I'm sure a lot of you guys want to hear that one too.

As we expected, the Roush axil back sounds great on the 2018 Mustang GT, and I'm sure will be a popular product, just like it was in the previous years. I should have mentioned before, this is obviously only for the cars with the passive exhaust system. As far as installation goes, figure about an hour. Be back on the road in no time.

Vehicle Fitment

This product will fit the following Mustang years:

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