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Roush Axle-Back Exhaust (15-17 V6)

Item 387040B
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      Review & Installation Video

      Hey guys. Adam here with Today we're taking a quick look at installing and listening to the Roush Axle-Back, available for the 2015 to '17 V6 Mustang. Now, we all know you can't make a V6 sound like a GT, but why do you have to settle for a factory exhaust note? We all know it needs some upgrades when it comes to that V6 motor, and the Roush axle-back does the trick. You can pick this thing up and get four out of five on our loudness meter, as you just heard from our sound clips. It's extremely aggressive, it is pretty raspy, and it lets everyone around you know that it is an aftermarket exhaust, and your V6 is not here to play any games. This is a unique one-chambered muffler, which we'll take a closer look at with a stock comparison side-by-side with the factory axle-back. Now, the muffler is a little bit smaller. That bullet styling gives you that resonated sound. Beefs up the volume, like I said, four out of five on the loudness meter, which is really, really good when it comes to a V6. Typically, you hear a lot of aftermarket exhaust for the V6 that really don't sound too much different than stock, which is why Roush is a very unique option in the category. The one thing I do wanna mention here is with the installation, you will have to cut off your factory axle-back, simply because it is all a one piece welded together from the factory line. So, cutting off that factory axle-back really isn't that big of a deal, but you wanna have a cutting tool of your choice, something you're comfortable working with, on deck. Personally, I like to use a Sawzall, which you'll see me work through in the install portion of the video, which I'll get to in just a second. Now, if you wanna pick this particular Roush axle-back up for your own V6, you can do so for just under 580 bucks which, again, compared to all the other options in the category, really isn't too bad of a price tag. You get the full 304 stainless steel, you get 4-inch slash cut polished stainless steel tips. Looks really good coming out the rear end. A lot better than the factory tips, in my personal opinion, and I think all of you guys will agree with that completely. Now, that installation, again, I am giving two out of three wrenches on our difficulty meter. It is extremely easy, in my opinion, but once you have that cut out of the way, it is one simple bolt on each side. You're just clamping them together with your factory pipe, and you're good to go. The cutting is the hardest part, but it really is not too bad, but for those of you not comfortable with it, two out of three wrenches on our difficulty meter. Expect to have this job done from start to finish in under an hour. So, without further ado, I wanna show you how it gets done. So let's get to it. Tools needed for this install will be a Sawzall or cutting tool of your choice, eyewear, 15 millimeter deep socket, cordless impact or ratchet. Now, before we can kick off the install of our Roush axle-back, we do have to do a little bit of uninstall, which does involve modification to the factory exhaust. We are gonna have to cut off our factory mufflers. As you can see, this is welded right under our subframe here. Now, we're gonna cut right behind that weld, really, right underneath our sway bar brackets that attach it to the subframe. Now, I have our driver's side muffler from Roush in my hand to use this as a reference to show you guys exactly where you're gonna need to cut. Now, again, remember, if you're not comfortable making the cut, make sure to take it to a shop that you're trusting to get the job done properly. Now, if you are handling it yourself, have a Sawzall on deck, which is what I'm gonna be using, or something you're more comfortable using yourself. So, again, I have the driver's side muffler here. I wanna show you guys, using this as reference, where you're gonna cut. So let's bring it in. All right. So, we're over here on the driver's side under the factory muffler. Now, holding up the Roush axle-back, you'll be able to see where our new pipe is gonna connect to our factory pipe. So, the weld is over here, but you wanna go where this starts to curve in. Right where it meets the curve for the axle-back on our factory exhaust is where you're gonna wanna cut. So, using a good reference here is, when you're holding this up, this is where you're gonna clamp. You wanna have all the factory pipe through here where this starts to bevel down. So, we're gonna cut right about here. Another good reference point, the sway bar bracket right at the edge, if you follow that down, it just about meets where you wanna be. So we can follow that down. I'm gonna mark that with a sharpie, break out our Sawzall, and cut them both off on both sides. All right. Just make sure you have some eye protection before you do this. Break out your Sawzall or a cutting tool of your choice, and get to work. Slide it out of the hanger. You can set it aside. We finally got our factory axle-back cut off of our factory exhaust on our '15 V6. We have it sitting on the floor here next to our Roush axle-back that we're ready to put on. Before we do so, I wanted to point out a couple of things between the differences of the two exhaust systems here. Now, as you can see, there is a clear size difference in the muffler, but that is not taking away from any of the sound you can expect from the Roush axle-back here. In fact, this is gonna be a lot louder and a lot raspier than your factory muffler here, making your V6 sound a lot better than it does off the factory floor. Now, what you also can expect is 304 stainless steel construction throughout, a unique one-chambered muffler design inside that bullet-style muffler, which gives it that loud and aggressive sound that you heard in our sound clips earlier on. Now, the mandrel-bent tubing helps with the air flow so you can expect a small power bump in both horsepower and torque. And coming out the rear end and, arguably one of my favorite parts of the whole entire system, is the 4-inch slash cut chrome polished stainless steel, which is just a whole lot better looking than these factory things that come out of the back end, which should've never looked like that from the factory. This thing is just a huge upgrade. It's got a Roush name embedded right in that material there, and honestly, it just looks really good coming out the rear. Now, the only thing we have left to do is install this on our V6, so let's just get to it. Now that we have our axle-back ready to go on from Roush, the first thing we're gonna do is slide our new hanger into our factory isolator underneath where our tip is going to enter here. So, if you've got that isolator up there, before we do anything, let's just slip that right into place. Really easily goes on, and if you need WD-40, that can help as well. Now, with this, you wanna take the smaller two hangers, which are gonna go on the pipe side. The larger two are for the tips. So, we have one of those smaller ones here. We're gonna slide that over the end of our Roush exhaust. Might be a little tight. We might have to loosen that up as well. All right. Get that in place. We're gonna slide this back to meet up with our factory exhaust. And with that in place, we can slide our clamp here and tighten that down. Now, you wanna make sure this is aligned properly, so that when you put the tip into place, it's gonna exit. So, you don't wanna tighten this too much. Just get it nice and snug for now. Next up here on our driver's side is gonna be the tip. Now, the tip here gets that larger clamp. We're gonna slide that over first. Slide the tip over the end of your muffler. Make sure it's aligned properly, you know, you wanna make sure that slant cut is at the top here. Align your clamp so that this is not hanging down. You don't want the bolt side of the clamp hanging down too low. You wanna rotate that upward a little bit, and tighten that down with your 15 millimeter socket. Well, that's gonna wrap up my review, install, and sound clip of the Roush Axle-Back, available for the '15 to '17 V6 Mustang. Again, you can pick yours up right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Aggressive Raspy Exhaust Note
      • Unique Open-Chambered Muffler Design
      • 304 Stainless Steel Construction
      • Full Mandrel-Bent Tubing
      • 4" Round Stainless Steel Tips w/ Chrome Flashing
      • Fits 2015-2017 V6 Mustangs


      Aggressive Raspy Sound. Let everyone know your V6 Mustang has arrived with the aggressive raspy sound of this high performance Roush exhaust. This innovative new Roush exhaust system features a hollow open chamber muffler that results in increased air flow and a unique sound, with no in-cabin "boom" normally found with performance exhaust at cruising speeds.

      Quality Roush Construction. Constructed from mandrel bent 304 stainless steel for a durable long life, the Roush axle-back exhaust system features two unique open chambered mufflers with 304 stainless steel 4" tips. The 4" tips are finished with a new chrome flashing process that is resistant to discoloration due to exhaust heat.

      Cut & Clamp Installation.
      The installation of this Axle-Back Exhaust requires cutting and removing the stock muffler assemblies, and clamping the new muffler assemblies in place. Clamps and instructions are provided.

      This Roush Performance Axle-Back exhaust system is designed to fit the 2015-2017 V6 Mustangs for both great looks and great sound.

      Fitment: 2015 2016 2017 Details

      MPN# 421837

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.6 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • March 17, 2020

        5 2016 V6 - Kirby Installation Time: Less than 1 Hour

        Roush Axle-back

        Very pleased with overall sound. My V6 now sounds much better than most stock GM V8s. Like many people, this is my first mod. It definitely will not be my last. It’s extremely easy to install, especially if you have a reciprocating saw. It only took about 15-20 minutes.

        Helpful (0)
      • February 26, 2020

        5 2016 V6 - CodyH Installation Time: Afternoon

        Love it!

        They give my car a sound that stands out and not in a bad way. Mu current set up includes these and I've had multiple people think my car is a v8 when in idle..

        Helpful (0)
      • February 11, 2020

        5 2017 V6 - Boricua Installation Time: Shop Install Installation Cost: 0-$100

        Roush muffler sweet sound

        After the mufflers were installed the sound was what I was specting!!

        Helpful (0)
      • December 20, 2019

        1 2015 V6 - JuanL Installation Time: Less than 1 Hour

        Worst purchase of the year

        Horrible DRONE. On the outside of car they sound great and look sweet. However inside the cabin they are like stabbing your ear drums with qtips the entire trip. On a scale zero to ten I'd rate stock exhuast: 2 on exhaust exterior loudness and 0 drone inside cabin. The ROUSH axle backs I'd rate 4 in exterior loudness and a terrible 7 for the drone inside the cabin. My mustang is actually louder inside the car than if you are standing outside right behind the muffler. I will add J-pipes in hope that it alleviates the drone at 2-3k RPM range. If that doesn't work I'm gonna javelin throw them Olympic style straight into the garbage bin.

        Helpful (2)
      • November 21, 2019

        5 2016 V6 - CAI Installation Time: Less than 1 Hour

        Nice growl, but not overkill

        These look great and have a nice growl! Not the loudest, but certainly nice sounding.

        Helpful (0)
      • November 08, 2019

        4 2015 V6 - Smitty Installation Time: Less than 1 Hour

        Looks great and installs quickly

        Although it looks great and installs less than one hour....the price is quite high (installer was shocked how much I paid for this). As for the sound......there is definitely a difference, mostly @ RPM’s over 2000. Perhaps seller would be willing to work out a much better deal (cost wise) with another product, such as breather item.

        Helpful (0)
      • October 29, 2019

        3 2016 V6 - Geram Installation Time: Less than 1 Hour

        Damage and dirty

        I received my box it looks old and damaged box one exhaust is damaged the pipe its like someone hit it and a little bit dirty like used The damaged muffler fix it at the shop About the sound it’s good Not to loud normal noise sound like to much bass very deep tone, shake everything inside the car in low rpms after 2500rpm sound nice Still good exhaust but expensive No drone

        Helpful (0)
      • October 18, 2019

        1 2016 V6 - ChaseB


        I had these installed with a flowmaster x pipe and it is so quiet. Can hardly tell if it’s the stock exhaust or not. Wasted so much money.

        Helpful (3)
      • October 10, 2019

        4 2016 V6 - VVV Installation Time: Less than 1 Hour

        Nice Exhaust

        Nice deep rumble added! A bit overpriced but a great product. Will me removing the resonator soon for louder sound though

        Helpful (3)
      • September 05, 2019

        5 2017 V6 - BrettJ Installation Time: Less than 1 Hour


        Gave me the nice deep rumble I was looking for! Took to have installed professionally

        Helpful (0)

      Questions & Answers (29 answers)

      5 Top Rated Questions

      Can the stock exhaust go back on after having this on?

      • Since this exhaust is a clamp on, you will be able to re-install the stock exhaust at a later point in time.

      Helpful (14)

      How bad is the drone

      • The Roush Axle-Back Exhaust will produce a small amount of drone, however this will be minimal.

      Helpful (13)

      Will the Roush Axle-Back fit the V6 convertible? The convertible has extra bracing.

      • The Roush Axle-Back Exhaust will fit perfectly fine on a V6 convertible.

      Helpful (8)

      Would there be any power gains with this Roush Axle-Back if so how much? And would the Flow Master Cat-Back give more power gains and how much? Thanks!

      • The Roush Axle-Back Exhaust will not add any additional horsepower to the Ecoboost Mustang but removes some restriction from the factory muffler which helps make some additional low end torque. The Roush Axle-Back provides a very durable construction as well as a strong, aggressive tone to give your Ecoboost the best possible sound.

      Helpful (4)

      Has anyone installed these themselves? Or did you take them to a garage?

      • A large portion of our customers choose to complete builds themselves and we do have an install guide that will cover the process for you here: You can always have these taken into a shop to perform the install as well if you do not have the time, experience, tools, or space to complete the job!

      Helpful (4)
      10 More Questions
      Will this axle back work with the 2016 ecoboost convertible?? 1 answer
      Hi! I just ordered this exhaust along with the Flowmaster Scavenger Series Cut and Clamp Resonator Delete Y-Pipe (Item 389694) for my 2016 Ecoboost, and I read that they will fit fine together but I was just making sure before I tried to get them installed. Thanks! 1 answer
      Will this exhaust fit on my 4.6 2002 0 answer
      I ordered this exhaust about 4 months ago and didn’t get the carb sticker 1 answer
      Just to confirm, if I buy only this, I don't need to buy anything else for the mustang to sound different? Sorry, I don't know anything about exhausts. 1 answer
      I already have the want to get a pair of these. Is there a video anywhere, with the Y-pipe/Roush axle-back setup? 1 answer
      I have Borla Touring cat back on my 2015 v6, If I get this can I just remove the borla axles and put roush without cutting on borla tubes? 1 answer
      I have Borla Touring cat back on my 2015 v6, If I get this can I just remove the borla axles abd put roush without cutting on borla tubes? 1 answer
      can these mufflers be installed with out a custom tune ? 1 answer
      We have Decibels limit in my country, do you know the DB level it would make on 2015 v6? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Muffler assembly - Driver Side
      • (1) Muffler assembly - Passenger Side
      • (2) Tips
      • (4) Clamps

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material:304 Stainless Steel Tip Material :304 Stainless Steel with Chrome Flashing
      Tip Size:4"Muffler Type:Open chambered
      Fitment:2015-2017 V6

      Will It Fit My Mustang

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