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MBRP Pro-Series Axle-Back Exhaust (18-20 GT w/o Active Exhaust)

Item 403866
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      Review & Installation Video

      Justin: The MBRP Pro-Series Axle-back Exhaust System for the 2018 and newer GT will be a full stainless steel option that gonna be deliver a bunch of sound, but for not a whole lot of money. In fact, at the time of this video that mid to high $300 price point, is gonna make this one of the most affordable in the category while at the same time still boasting that 304-grade stainless steel build. Install will involve some cutting as is the case with any S550 axle-back. So, we're gonna nod just one up to a soft two out of three wrenches on the difficulty meter with a more detailed walk-through to come later in the video. Now, in my opinion, MBRP does a great job of making a wide variety of systems out there utilizing a few different materials that basically make them appeal to a wide variety of budgets. And while I will say that is gonna be a little bit more apparent in their cat-back lineup, they have a lot more to choose from there. The axle-back category still does have a few different flavors to choose from as well. Now, at first glance, it does become immediately apparent that this system will be a tad on the loud side. Why? Well, because there are no mufflers anywhere in sight. In fact, this kit does delete those factory mufflers and turn straight piping your factory exhaust system essentially from that resonator on back. The end result here, guys, is gonna be one of the most aggressive axle-back systems you can get and most aggressive tones that you can get without removing the cats or the factory suitcase style resonator. But let's not waste any more time with this system. Let's talk about the sound you can expect when bolting up the Pro-Series to your 2018 or newer GT. And again, things are pretty aggressive here with this axle-back installed as you would imagine, right? So, going to patented one to five or one to wake the neighbor scale. I have this system coming in at a rather strong four out of five. And because that factory resonator still is in place, the sound is gonna maintain a good profile. Meaning, it's not gonna be too raspy, it's not gonna be too distorted, and best of all the interior noise is surprisingly minimal overall. Now, MBRP, I would like to think helped me coin the phrase, "Bark for your buck." In this system, the Pro-Series really does embody that very well. On top of that killer tone, you're also getting some of the finest materials out there thanks to the 304-grade stainless steel throughout from tip to tip making this the calling card of the Pro-Series systems. Now, that will include the small amount of two and a half inch mandrel bent tubing here, finally, all exiting out of your quad tips, 4-inches in diameter and etched with that MBRP logo. And because you are working with that high-quality stainless steel build, MBRP does back this entire system, the Pro-Series here with their full lifetime warranty against any possible defects. With all that said, let's talk about the installation and as I mentioned earlier guys, there is a small amount of cutting involved here, but that really is the case with any S550 axle-back. It's notthat bad as long as you take the time, measure twice, cut once and you'll be good to go. But to give you a better idea of what's expected with this job, here is a detailed walk-through in addition to a tool breakdown. Man: First thing we're gonna do here is make a mark on our cat-back, that's gonna show us where we need to cut so we can remove the factory axle-backs. So, what we wanna do is find our muffler and then come down right after the bend. As soon as the bend stops and you have a section of straight pipe, that's where we wanna cut. I'm gonna go ahead and make a mark here. And we'll do the same thing on this side. You wanna find your bend. Right after the bend, you're gonna have a straight piece of pipe and we'll make our cut line right here. We're now ready to cut our factory axle-backs out of here. I got a metal cutting blade on my Sawzall. Let's go ahead and get this guy cut. So, I'm about halfway through the pipe here. I did throw a pole jack up in place here, so when I go all the way through this muffler doesn't come down and hit me on my head. All right. We've got our axle-back cut now. I'm gonna slide the stock muffler out of place and just spray the upper hanger with a little bit of WD-40. Should be able to just slide this right on out of our hanger. Next thing we're gonna do is clean up the cut end of the pipe that we just made. I'm gonna be using a die grinder with a carbide tip. If you guys don't have one of these, a round file or a piece of sandpaper will do just fine. We're now ready to install our axle-backs. First thing I'm gonna do is slide a clamp on the end of our pipe here. Next, I'm gonna slide our hanger up into our rubber isolator to get that started. And then, finally, we can come down here and make the connection. All right. So, I've got my clamp on the end of our pipe here. And again, I'm gonna slide them up into the hanger and come back and make the final connection. Next thing I'm gonna do is tighten our clamps up before we put our tips on. I have a 15-millimeter socket on my impact gun here. We're now ready to install our tips. Let's go ahead and slide one of these on here and I will using a 5/16 Allen wrench to get these tightened down. And we'll do the same thing on the other side now. That's gonna wrap up our review and install. Be sure to check out more at

      Product Information

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


      • Pro-Series Axle-Back Exhaust
      • 2.50-Inch Mandrel-Bent Tubing
      • T304 Stainless Steel Construction
      • 4 in. Quad Polished Dual Wall Tips
      • Aggressive Sound and Improved Styling
      • Axle-Back Design Provides Simple Bolt-on Install
      • Substantial Weight Savings over OEM Mufflers
      • Includes All Necessary Hardware
      • Improved Horsepower and Torque
      • Resistant to Corrosion and Rust
      • Limited Lifetime Warranty
      • Fits All 2018-2020 Ford GT Mustangs Without Active Exhaust


      High Impact. Are you looking for an exhaust system that will make a statement everywhere you go in your 2018-2020 Mustang GT? Then look no further than the MBRP Pro-Series Axle-Back Exhaust. You’ll get improved horsepower and torque with this stellar exhaust.

      Built to Perform. Resistant to corrosion and rust, the polished dual wall tips add flare and style. You will love the aggressive sound and the lightweight design that is a substantial weight savings over heavy OEM mufflers. Built to be a perfect fit for your GT, this exhaust fits convertible and fastback models as well. Crafted from T304 Stainless Steel, this exhaust features a 2.50-inch mandrel-bent tubing with 4-inch quad tips

      Installation. This intermediate install can be completed with basic hand tools, a hoist, or an extra set of hands in approximately 2 hours. For installation convenience, quality hardware and instructions are included.

      Warranty. A limited lifetime warranty covers this product if a defect or imperfection is found as a result of faulty manufacturing.

      Application. The MBRP Pro-Series Axle-Back Exhaust fits all 2018-2020 Ford GT Mustangs without active exhaust.

      Fitment: 2018 2019 2020

      MPN# S7211304

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (52)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 52 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • March 21, 2020

        5 2018 GT - KarlH Installation Time: Afternoon

        Simple and sounds great

        Install is pretty straight forward. Cut, hang, tighten hose clamps. I had an issue with mine not sitting even, so I had to fabricate a shim for the passenger side. Even then, install took like an hour so not bad. Simply removing the mufflers sounds amazing, definitely worth it. These tips look better than the stock ones too, Ford really phoned in the stock exhaust tips. If you’ve got the cash, these are a must.

        Helpful (0)
      • March 17, 2020

        5 2019 GT - JacobO Installation Time: Less than 1 Hour

        LOUD LOUD

        If that is what you are looking for, something that is LOUD LOUD then these are it. Cold starts are GREAT(obnoxiously loud) for about 15-20seconds, sets off alarms and all. I paired these with an H pipe and it has a great deep rumble even at higher RPM's. The drone is pretty bad when getting up to speed and cruising between 70-80 RPM's. I am thinking of adding some SLP mufflers just to tone it down just a lil bit. But not sure yet cause I love the raw sound. I asked my buddy if it sounds good or just very loud. He said he loves it and sounds like old school muscle car. He owns a R/T Challenger with a mid muffler delete and he said my car is louder by far. Install was super easy.

        Helpful (0)
      • March 03, 2020

        5 2019 GT - Waters98


        Got these really fast, i have a 2019 5.0 with long tubes and a x pipe car sounds very good would recommend for anyone looking for some noise

        Helpful (0)
      • March 01, 2020

        5 2018 GT - nickeco Installation Time: Less than 1 Hour

        Amazing exhaust

        The MBRP Axle back is one of the best axle backs to buy. It’s loud but not over the top like others. Installation is quick it’s safe to say it’s worth the price tag!

        Helpful (1)
      • February 06, 2020

        5 2019 GT - JCmrz Installation Time: Less than 1 Hour

        love it

        looks and sounds awesome best bang for you buck...

        Helpful (0)
      • December 28, 2019

        5 2018 GT - Tpage737474 Installation Time: Less than 1 Hour

        Sounds good

        Cold start is loud, quiets down after 15 or so seconds. While driving it in gear and letting off the gas the raspy back pressure can seem annoying. I enjoy it for the price!

        Helpful (0)
      • November 11, 2019

        5 2018 GT - Metallic Installation Time: Less than 1 Hour


        I am very satisfied with the exhaust..they are loud without sounding annoying!

        Helpful (1)
      • September 17, 2019

        5 2018 GT - Er Installation Time: Less than 1 Hour

        Great sound, Perfect fit

        Had this exhaust system installed on my 2018 Mustang 5.0. It now sounds like a Mustang should, heavy growl. Love it

        Helpful (1)
      • September 16, 2019

        5 2019 GT - MarkA Installation Time: Less than 1 Hour

        Great buy

        I love the sound of my Mustang now it sounds like a real muscle car should. The only change I made to my exhaust was the axle back. Very little drone while cruising but has that extra umph when you give her the gas. Could not be happier with this purchase.

        Helpful (0)
      • September 09, 2019

        5 2019 GT - DM323 Installation Time: Less than 1 Hour

        Great Quality Exhaust

        If you are looking for a axle-back, this should be on the top of your list. The stainless steel quality is amazing for the price and the exhaust tips stand out. I currently have this system with the stock resonator, and it is loud, for 2 days my ears hurt a bit and the drone was kinda bad but I got use to it quickly. The car pops occasionally when revving it high and it sounds raspy. I plan on pairing this with an H-pipe to eliminate the raspy noise from this muffler delete axle-back from MBRP.

        Helpful (1)

      Questions & Answers (14 answers)

      5 Top Rated Questions

      Does this muffler really increase hp.

      • There are dyno proven gains in conjunction with this exhaust. This and all MBRP systems will undergo Dynomometer testing, as well as hundreds of miles on road and track as well as other refinements to get the maximum performance.

      Helpful (3)

      Do you have to buy 2 because it says each?

      • Purchase of this will include the entire axle-back exhaust system and the hardware needed for installation.

      Helpful (1)

      With Muffler Delete does my 18 need a tune? I also plan on x Pipe with both installed is tune required?

      • Neither an axle back exhaust or mid-pipe upgrade will require an updated tune. Any upgrade to the catalytic converters and forward will require a tune update for the vehicle to operate properly. 

      Helpful (1)

      Do i need to buy two peaces ? or 397 for both of them right and left side?

      • This comes with both sides for the axle back.

      Helpful (0)

      Why would this not a fit a 2018 mustang EcoBoost?

      • This is designed for the GT models. It will not fit the EcoBoost models as the exhaust is not the same size piping.

      Helpful (0)
      Post Your Question
      9 More Questions
      I have a 2017 mustang gt and my diffuser fits quad tips. Will I still be able to put these on ? Seems like the 15-17 model just with quad tips 1 answer
      Would you recommend the MBRP or the Roush axle back? Personally from videos they sound really close. But there's also a $250 difference as well and I am just not seeing the extra money worth. 0 answer
      Will these fit a 2019 mustang gt with active exhaust? 1 answer
      Why does the sound rates lower than Roush exhaust when this is actually a muffler delete? Also, wouldnt make the same soumd if you just delete your pipe and weld tips? 1 answer
      Would they fit a gt350 rear valance ? 1 answer
      It says this reduces weight over OEM mufflers but nowhere online, either here or on MBRP's site can I find exactly how much weight savings that is. Please don't answer me with a guesstamate either, I wanna know exactly how much weight you drop off a '18 GT by doing this upgrade. Thanks! 1 answer
      It says "each" so would I have to order 2, one for each side of exhaust pipe? 1 answer
      Would these work if I already have the cat-back system but just want to change the axle-backs? 1 answer
      Would these fit a 2015-2017 with a Roush Rear Valance? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Pro-Series Axle-Back Exhaust
      • Hardware
      • Installation Instructions

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