Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now
Coronavirus: We are Open For Business, Prioritizing health and safety Learn More

Roush Extreme Axle-Back Exhaust (05-10 GT, GT500)

Item 387146
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $577.99 You Save 12% ($67.00)
Our Price


FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Review & Installation Video

      Hey, what's up everybody? I'm Justin with, and this is my detailed review of the Magnaflow MF Series Cat-Back Exhaust System, featuring the dual same side exit configuration, which dumps before the passenger rear tire. Available for all 2015 and up, 2.7 liter Ecoboost Powered Supercrew & Supercab F150s.All right, guys, in this video we're going to cover three big topics. We're going to talk sound you can expect here with the Magnaflow MF Series. We're gonna talk about the materials used in this system. And then finally we're gonna do a quick, little walk through of the install itself. And honestly for most of you guys out there, it's going to be one out of three wrenches on the difficulty meter. Nothing too crazy here. So we'll have a little bit more detail coming up on that later on.The Magnaflow MF Series Cat-Back here is going to be a great choice for newer Ecoboost owners out there who are after a really well made system from a quality brand like Magnaflow. You want just a little bit more noise, both inside and outside of the truck. And finally, and maybe more importantly, you want the very cool dual same side exit configuration that will dump before the passenger side rear tire. So again, guys, this is just going to be for someone who wants a little bit more sound, and maybe isn't concerned with being the absolute loudest truck on the block.So with all that said, let's take a close look at this cat-back. Magnaflow is definitely one of those companies that's known for making some pretty solid stuff over all, using 100% stainless steel for the most part. All of which is gonna fit great, and produce some pretty well rounded tone. Now the MF series that I have here certainly checks all of those boxes. And I think you'll find that this is just one of many different offerings for your Ecoboost powered truck here on the site for Magnaflow.This particular option again, that I have in this video, is that very cool dual same side exit that will dump before the passenger side rear tire, much like the older SVT Lightenings. They also offer the same exact system a little longer, that will dump after the rear tire. A little bit more of a traditional configuration. They also have the very popular dual split side exit system, and just a more traditional single side exit system as well. So again, as you can see guys, they have just about something for everyone.Now all these systems that I just mentioned are going to utilize the same MF Series muffler here, guys. So don't expect a huge variation in tone from one system to the next. Instead it's going really just going to boil down to what kind of look you're after with your exhaust, and how much dough you want to spend.As far as a tone you can expect when installing the Magnaflow MF Series here. Well, you guys heard the sound clips. Ultimately you can be the judge. But in my opinion guys, this is one of my favorite exhaust systems for the Ecoboost powered trucks, and here's why. You're getting just a little bit more tone over that factory system. Again, these are Turbo V6 engines. A lot of us guys don't want to really advertise that too much. We know it's not a V8. It'll never sound like a V8. So if you can get something that says, "Hey, I'm not stock. But at the same time, I'm not going to drive the family crazy," well again, this is gonna be a great system for you.Breaking out the wake the neighbors scale, I'm going strong two out of five here, guys. Again, just slightly louder than your factory system. Interior noise is practically non-existent. So a perfect choice for a daily driver, or family hauler that does see a lot of road trips.But let's talk about how Magnaflow achieves that nice, deep tone here with their cat-backs. And as you might imagine, a lot of it's going to come down to the MF Series mufflers that they incorporate with a lot of their Ecoboost or truck systems in general. You're going to find a perforated tube inside of the actual muffler itself. And also a combination of a stainless steel wrap, and an acoustic material that does a great job of rounding out the sound with their systems. But again, you are getting that nice, deep, rich tone with the Magnaflow here. I like to call it a nice full bodied tone. You're not getting the high end, raspy pitch with the Magnaflow Systems whatsoever. So if that's what you're into, this is a great choice.You're also getting that straight through muffler. Again, you might see a little bit more performance out of the truck with this system. But ultimately when you're adding a cat-back to your newer Ecoboost F150, you're mainly making a sound, and an appearance upgrade more so than a performance upgrade.Breaking down the fine details here with the construction, guys, you're going to find 3 inch mandrel bent tubing. It's a smaller system overall, as you can see. And of course the three a half inch, brightly polished, slash cut tips. They look awesome when installed on a truck. Again, I really dig this style of system. You're looking at 409 grade stainless steel here throughout. Again, they do a great job at reducing corrosion. Help keep the price down slightly compared to those more expensive 304 grade systems. Everything's made in the USA, and everything is backed by a lifetime warranty.On the topic of price, guys. I think you'll find a lot of the Magnaflow options here on the site for you F150 are going to fall on the higher side of the mid-level price range. And what does that mean to you? Well, these things aren't gonna set you back as much as the Corsa stuff or the Borla stuff price for instance, but you are gonna be dropping just south of a 1,000 bucks, which still is a good chunk of change, I'll give you that. But you have to factor in you're getting some pretty solid materials, and a A plus build quality.Now if you really like the dual same side exit configuration, but you have a really tight budget, MBRP is gonna make a few systems that will give you this similar look. It's not gonna be as nice as the Magnaflow. But it will definitely get you there, if that's what you want. As I mentioned at the top of this video here, this is gonna be a simple one out of three wrenches on the difficulty meter when it does come time to get everything bolted up. In fact, removing your factory system, getting this new guy in place here, only gonna take you about an hour or two using some basic hand tools. And by basic, I'm talking 13 and a 15 millimeter socket. Cordless impactor air will certainly help the job go a lot quicker but overall, you can do this thing with basic hand tools on your back if need be.Now this is a Supercrew or Supercab specific truck. So go ahead and remove that factory system first. Get the new Magnaflow in place in reverse order, starting from front to back. And you should be making noise in no time. As an Ecoboost owner myself, I really enjoy the Magnaflow MF Series Cat-Back based on the sound alone. Now again, a lot of us V6 owners don't exactly want to crank up the volume, like the V8 truck owners out there. And if that does sound like you, then I really do think you'll enjoy the system. Pair that with a quality build, the great materials, and the very cool dual same side exit configuration, and again, you've got a great system if you don't mind spending close to 1,000 bucks. So that's my review of the Magnaflow MF Series Cat-Back which you can find right here at

      Product Information

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


      • Tough, Aggressive Growl
      • Straight-Through High-Flow Resonators
      • 2.5" 409 Aluminized Stainless Steel Tubing
      • 4" 304 Stainless Steel Tips
      • Flash Chromed Dual Wall Tips w/ Roush Logo
      • Fits 2005 to 2010 GT and GT500 Mustangs


      Tough, Aggressive Growl. Let your 2005-2010 GT or 2007-2010 Shelby GT500 Mustang growl with a Roush Extreme Axle-Back Exhaust System. This innovative Roush exhaust system features straight-through high-flow resonators, providing increased air flow and that unique tough, guttural sound with no in-cabin exhaust drone.

      Quality Roush Construction. Designed for a durable long life and corrosion resistance, the Extreme Axle-Back is constructed from mandrel-bent 2.5" diameter 409 aluminized stainless steel tubing. Utilizing stock mounting points and pre-welded hangers, this axle-back features (2) 4" flash-chromed 304 stainless steel dual wall tips that have been completed with the "ROUSH" logo for impressive looks.

      Application. This Roush Extreme Axle-Back Exhaust is designed to fit the 2005-2010 GT and 2007-2010 Shelby GT500 Mustangs with the factory rear valance, not cutting or fabrication required.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 421915

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (100+)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 100+ customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • March 20, 2020

        5 2005 GT - Havien Installation Time: Less than 1 Hour

        Great product, but won't fit roush rear bumper

        Product looked great. But does not line up at all with the roush rear bumper with exhaust cutouts and rectangular tips. Do not even try if your car has the bumper. Only kit that works is the roush off road axle back. Roush part number is 401339

        Helpful (1)
      • February 08, 2020

        4 2010 GT - BrittanyS Installation Time: Less than 1 Hour

        Good sound, fit is weird for 2010

        I call it the 2010 curse, buying things that fit “2005-2010” is always a gamble for the proper fit. I couldn’t even use my back exhaust hangers because they went a few inches too far. I still used the fronts, and they seem secure enough until I get they energy to modify where my existing hangers are. That said, they make a MUCH deeper sound than my old Flowmaster American Thunders, and the chrome looks good with the all black and chrome emblems.

        Helpful (0)
      • January 26, 2020

        5 2008 GT - dewiel


        Great sound!! 2 hours 1 to get the car off the ground. And one to install

        Helpful (0)
      • January 14, 2020

        5 2007 GT - gp Installation Time: Less than 1 Hour


        they were easy to install, and they sound awesome!

        Helpful (0)
      • December 21, 2019

        5 2008 V6 - MiriahB Installation Time: Less than 1 Hour

        Sounds amazing

        I have a v6 with the x pipe conversion. I had slp gt axlebacks but wanted to try something different. The roush definitely have a deeper tone at idle but the slp's take the win for higher rpm. I'm torn between the two. Would recommend roush if you want that deeper tone. Overall they look and sound great! You get what you pay for.

        Helpful (0)
      • November 30, 2019

        4 2010 GT - Brandon429 Installation Time: Less than 1 Hour


        Stock automatic GT. My biggest concern with buying a exhaust was the drone. This exhaust has no drone on highways but you do hear a little when cruising around towns shifting from 1st the 2nd. It’s not bad at all.. I’m absolutely amazed with the sound. Didn’t want to go too loud and this is a perfect sound. Deep throaty rumble below 3k rpms and SCREAMS at wot . Just what I was looking for. Can’t go wrong with Roush like they say. It took me and my brother about a hour and a half to bolt it up. Only complaint I have is the passenger side hangs a bit lower than driver side. Gonna take another look at it soon. Everyone knows that the stock exhaust is lacking.. Think back to why you bought your mustang. You didn’t buy it to take your grandma to church. If you do take her, this might not be for you. Go with this product and Destroy all enemies on the road!!! Trust me, video does NO justice on the sound. Buying this product will maker you feel like your living the great American dream.

        Helpful (4)
      • September 20, 2019

        5 2010 GT - SendMe Installation Time: Afternoon


        100 satisfied with my purchase. The parts I purchased arrived within days!

        Helpful (1)
      • August 13, 2019

        3 2010 GT - WilliamM Installation Time: Afternoon

        Sound Great, easy to install

        Sound great, especially on a cool morning, just blurbling away.. I have an automatic, and I do get a bit of a drone at above or around 2k, but once it's in Overdrive, it's ok..

        Helpful (3)
      • July 19, 2019

        5 2007 GT500 - StckRx Installation Time: Shop Install Installation Cost: 0-$100

        Roush atxle back

        I'm glad I pulled the trigger and got ER done. Sounds great, not too loud. Almost though.

        Helpful (0)
      • July 19, 2019

        5 2005 GT - Glenntime

        Perfect replacement.

        Replaced these w/ my old loud mouth cat back works great

        Helpful (0)

      Questions & Answers (34 answers)

      5 Top Rated Questions

      Are these basically muffler deletes? Or are they actually “mufflers”

      • This Roush Extreme Axle-Back Exhaust are extremely aggressive but they do have resonators built into the unit.

      Helpful (2)

      Are these 50 State Legal?

      • These are 50 state CARB legal but may not pass the sound laws in some states.

      Helpful (1)

      Will these fit with the Mustang Pypes Long Tube Headers w/ Off-Road X-Pipe (05-10)?

      • These will fit just fine yes!

      Helpful (1)

      Will this exhaust line up to my 2006 roush stage 2 mustang rear bumper? I know the square tips will work. Stock mustang gt exhaust wont line up correctly is why i ask. Thank you, Andy

      • Unfortunately, we have not tested this exhaust on the Roush Mustang. However, due to Roush designing this exhaust for the GT and GT500 model Mustangs, we do not believe this exhaust would fit properly.

      Helpful (1)

      Will the roush exhaust work with the bbk longtube headers? Also my car has straight pipes on it, will I need to buy anything else for the roush exhaust or will it work with what I have on there now?

      • The Roush Extreme Axle-Back Exhaust will fit with BBK Long Tube Headers. They are designed to direct replacements for the factory axle back exhaust, and do not need any additional parts for installation.

      Helpful (1)
      10 More Questions
      Will the Roush Extreme Axle-Back Exhaust fit on the pypes true dual x-pipe conversion kit for the 2005-2009 v6 mustang? 1 answer
      I have a 09 GT, and when I bought the vehicle used it came with Magnaflow mufflers. Will I need to purchase anything else to replace what's on my car with the Roush axleback? Or will this system just bolt on to my midpipe? 1 answer
      I know that they state 'no in-cabin drone' but want to be sure. My current aftermarket exhaust has a terrible drone between 2K-3K rpm. Do you experience any such in-cabin drone with these? 1 answer
      My car is a regular v6 mustang. Will I still be able to use these for my car? 1 answer
      I have a tuned mustang 09 with roush axle back I'm having a problem because of the axle back it's too loud, is it loud because my car is tuned or there is another reason, please can you help me . Thanks 1 answer
      2008 GT Vert I’m currently coming off the cats, no muffler. Will these be obnoxiously loud? 1 answer
      Will this fit on the kooks catted x-pipe? 1 answer
      Where would these sit on the "wake the neighbor" scale? 0 answer
      I have a 2008 GT500 and I want to do an offroad H-pipe with the Roush Extreme exhaust, but I am not sure whether to buy an axle-back or cat-back when pairing it with an aftermarket offroad H-pipe. What is the difference? I will be sticking with my stock headers. 1 answer
      How useful would a hanger kit be for this exhaust and would it help long term thank you 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) Axle-Back Assemblies
      • (2) Dual Wall Tips
      • (4) Clamps

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material:409 Aluminized Stainless Steel Tip Material :304 Stainless Steel w/ Chrome Flashing
      Piping Size:2.5"Tip Size:4"
      Muffler Type:Straight-throughFitment:2005-2009 GT Mustangs

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10
      • GT500 - 07, 08, 09, 10

          Related Mustang Categories