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X-Force Varex Axle-Back Exhaust (05-10 GT, GT500)

Item 386427
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$764.10 (pair)

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      Review & Installation Video

      The X-Force Varex axle-back is something that you should check out if you have a 2005 to 2010 GT Mustang and you want an axle-back that'll give you the ability to change the sound and loudness of your exhaust on the fly from inside of the car. That's going to be the biggest differentiator with the Varex. Not only that, but the Varex will also appeal to those owners out there who would like a top-quality system when it comes to materials, and someone that doesn't mind spending a little bit to get all of these things. The install for this is easy. It's a one out of three wrenches on the difficulty meter, since an axle-back for this gen simply bolts right up into the stock location. But I'll get more into that later. You might not have heard of X-Force before, but they're actually a very popular and established brand down in Australia for quite some time now, where they originated. The Varex is their patented system. It's been around for a few years, so I wouldn't say that this system is new to the game. Like I mentioned earlier, this is a tunable exhaust and I will say that a lot of companies have tried the tunable exhaust thing before, with varying levels of success. X-Force and Roush are the two companies that I think did a good job with this design. You have options with the exhaust tuning. You aren't just stuck with either open or close, and I'll explain more in a second. Getting into it a little bit further, like usual with an axle-back, the main player of this axle-back and the centerpiece is the patented Varex mufflers that feature a mechanism or a butterfly within the actual muffler itself that functions a lot like your traditional cutout would, and all this is controlled by the included remotes. Now, unlike those traditional cutouts that are generally fully open or fully shut with no options in between, the Varex gives you the option to customize your sound with a level of adjustment, essentially giving you five different mufflers in one, as Varex puts it. This is achieved by opening the butterfly valve in different increments, changing the tone slightly along the way. So what does all this mean when it comes to sound and overall volume? What you guys heard in the sound clips and I'll say it again, the difference in sound is noticeable. With the valve fully closed, the sound or volume is very similar to what you'd find with the factory mufflers still in place. Maybe just a little bit louder, but not by very much. With the valve fully opened, it's another story. The sound really comes to life, and it's a good sound at that. There's plenty of tone, no rasp to really speak of, and a decent amount of overall volume. With everything closed up, I'd give this system a one out of five on my one to five scale. With everything opened up, that number easily shoots up to a strong two out of five on the loudness scale. It's not the loudest setup, but it does have a nice deep tone with zero drone inside of the car while cruising. There's a number of reasons why having full control over your tone and volume might be appealing. The most obvious would be to have the ability or the option to be quiet when you want to be or when you need to be. Say you're entering or leaving a neighborhood or an apartment complex, for that matter, or driving by Johnny Law. Maybe you have your significant other in the car and they aren't a fan of a loud exhaust, or maybe you're just trying to play the role of a sleeper. Whatever the case may be, Varex will be able to help you out. Now that you know what to expect, let's talk about the build of the Varex, because again you're getting more than just adjustable sound here. For starters, you're getting a full 304-grade stainless steel throughout, which is the best material in my opinion when it comes to exhausts, especially when it comes to resisting corrosion. The Varex does bolt right up to the factory location, and then it steps up to a full three-inch, mandrel-bent tubing throughout. It has very nice welds and four-inch, brightly polished stainless steel tips. So the Varex Performance mufflers are chambered, and that's where the butterfly valve comes in. So I have this muffler flipped around, so you guys can see what's going on here. This is the valve and with the valve fully closed, the exhaust flow goes through more of a chambered section of the muffler, keeping things relatively mild, sound-wise. However, once opened, the exhaust takes the path of least resistance. Essentially, this acts as a straight-through muffler, which is going to increase both sound and performance. It's all incorporated by the key fob that X-Force is going to give you. Each fob has two buttons, one to open the valve and one to close it. Again, you can play around with the sound by experimenting with the fob and the buttons. The butterflies are powered by a 12-volt source. X-Force includes the plug-and-play harness to get you up and running. The harness is going to plug into both mufflers right here, using water-resistant plugs, and from there it's fished inside of the car, through the trunk, to be plugged into the 12-volt power socket inside of the center console. This is a total plug and play deal here, guys. When it comes to price, as you probably expected, this isn't what I consider a cheap system. You can expect to spend a little over the $750 mark for this axle-back. You have to keep in mind what you're getting here, the adjustable tone, the full 304-grade stainless steel, and this is pretty solid for the price. In case you were wondering, X-Force does back the Varex with a one-year warranty on the electronics and butterfly, and a five-year warranty on the mufflers themselves. The install is pretty standard in the world of axle-backs, with a few exceptions. You're looking at a one out of three wrenches on the difficulty meter. You can plan on spending an hour of your time. You need a basic socket set and having a helping hand can help you out here. A lift would certainly make things easier for you here, but the job can be done on jack stands as well, if you don't have access to one. This axle-back very simple bolts right up into the stock location, so you won't have to cut or modify anything. You're just looking at dropping your old axle-back and the new axle-back will come with new clamps for you, so you don't have to worry about that. When you go to install your new setup, it'll probably be easiest to leave everything loose until you have it all lined up, and then tighten it down. When it comes to the wiring, again, everything is completely plug and play. With the harness connected to the mufflers, you run it up into the trunk, through the removable grommet in the spare tire area, and then from there you need to get it to the center console area to be plugged into the 12-volt socket. This might take you a little bit of time to do, as you'll probably want to hide the wire as well as you can under the carpet for a clean install. That's going to be it for this review of the X-Force Varex, but you can always check it out more online right here at

      Product Information

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


      • AmericanMuscle Exclusive
      • Varex Axle-Back with "Adjustable Sound"
      • Street Mode, Race Mode and Anywhere in Between
      • Electronically Controlled
      • Durable Stainless Steel Construction
      • 4" Polished Slant Cut Tips
      • Direct Bolt-On, No Cutting or Welding Required
      • (2) Remote Control Key Fobs Included
      • Fits 2005-2010 GT and GT500 Mustangs


      Adjustable Sound. The Varex Mustang Axle-Back Exhaust system features adjustable Varex performance mufflers that allow you to switch from a mellow Street sound to a rich throaty Race style exhaust note or anywhere in between the two with just a push of a button!

      How It Works. Varex performance mufflers utilize a sophisticated internal electronic butterfly valve mechanism to direct the exhaust flow within the muffler. In the open position the valve "uncorks" the exhaust flow allowing it to take the path of lease resistance to act more like a straight-through muffler for a rich throaty race style exhaust note. In the closed position the valve blocks the exhaust flow forcing it through the chambered paths to produce a classic mellow street friendly sound. This unique design is perfect for personalizing the power and sound levels of your Mustang to suit your own specific needs.

      Stainless Steel Construction. Manufactured from high quality stainless steel for it's superior durability and corrosion resistance, this Varex Axle-back features two adjustable chambered mufflers that end  with massive 4.0" diameter polished stainless steel tips that exit in the stock location for impressive muscle car looks and sound.

      Direct Bolt-On Installation. Engineered to be a direct upgrade replacement, this Varex axle-back will easily bolt up to the stock piping without any modifications required for a straight forward installation. The control module can be powered by your Mustangs 12v accessory outlet for plug and play operation or connected to a 12v source - the choice is yours.

      Application. This Varex Axle-Back Exhaust is designed as a direct fit bolt-on upgrade for the 2005 to 2010 GT and GT500 Mustangs.

      Fitment: 2005 2006 2007 2008 2009 2010

      MPN# ES-FM10-VMK-ABS

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (13)

      Write a Review

      Ratings Summary

      4.2 out of 5 overall rating from 13 customers

      Installation Time: Afternoon

      Installation Cost: $100-$250

      • September 13, 2019

        2 2007 GT - DennisH Installation Time: Less than 1 Hour

        Great idea, horrible execution

        So just put these on 3 days ago and while I have to admit the idea is amazing and it does quiet down my car a lot (cams, off road H) it barely gets louder when the valves are opened. When the valves are closed there is a side hole that redirects air into the muffler and put past the valve. But for some reason the middle section of the muffler where air travels through when the valve is open also has baffling and makes the exhaust quiet even when open. So it goes from quieter than stock to slightly louder than stock. Great idea, terrible execution I have no idea why they would add baffling to the straight pipe part. Should not cost $750 when it falls flat on its face from what it should have been.

        Helpful (0)
      • March 12, 2019

        5 2008 GT - WesleyT Installation Time: Full Day


        Sound is awesome but it took a lot of time to center tips to bumper, they need to recheck their jig for brackets they weld on but once on everything worked great

        Helpful (0)
      • February 25, 2019

        5 2008 GT - ChrisW Installation Time: Afternoon


        They are a direct bolt on and look and sound great.

        Helpful (1)
      • February 12, 2019

        4 2010 GT - JuniorA Installation Time: Afternoon

        Very helpful

        After owning this product for some time now, I can say that it works perfect for me especially because I live in California and loud cars are being constantly pulled over, but with this product I can quite my car down trumendesly. Even though I used to be straight piped.

        Helpful (1)
      • September 26, 2018

        2 2006 GT - LarryO

        Needed a pro to install

        Required welding of new clamps, cutting, and fitting as the mufflers were slightly bigger than originals.

        Helpful (2)
      • February 15, 2018

        5 2010 GT - Steve Installation Time: Shop Install Installation Cost: $100-$250

        from stock to outlaws to x-force

        i went from stock to flowmaster outlaws. The outlaws are amazing and incredibly loud and fit perfect. the downside was the drone! At 2k rpms, I thought my ears were gonna bleed. I'm well out of my thirties and my drive time on the hwy is 30 minutes. The outlaws were not the product for me. I took a chance on this relatively expensive set and wow what a diff. these are exactly what i want! The fitment was poor and my son who is a mechanic had to do some cutting so it would not have been a diy garage job. Took him an hour on a lift in a pro garage. Fitment aside, these are perfect for my aging ears. Perfectly quiet when closed with a mild rumble when i gun it. When opened they are significantly louder (although nowhere near the outlaws) and have an even more aggressive sound. there is a drone when opened but you can barley hear it. In fact, its so slight you need to turn off the radio, stay at 2k rpms and listen for it. When closed, NO drone at all. Love this product and love playing with the fob! If you have grandkids, and own a "midlife crisis" mustang like me, get this exhaust.

        Helpful (3)
      • January 19, 2018

        5 2007 V6 - StephenD Installation Time: Full Day

        Xforce 07 GT

        Let's face it, when modifying your exhaust it all comes down to sound and I wanted control from one extreme to the other. Price should also equate to quality. Happy to report I got both with the Xforce system. Sound open position; just a noticeable change in the cabin, outside the car a completely different story, awesome loud V8 muscle (headers,H pipe,Xforce). Sound close position; not much louder then stock set up. This modification was worth every penny and delivered exactly what I was looking for. I hard wired with a rocker switch inside the cabin but can also utilize the fob when demonstrating this system to friends. Easy install but as with any exhaust mods, takes a little time to get the exhaust tips adjusted absolutely perfect. Xforce exceeded my expectation on fit, quality and performance! Thanks American Muscle!

        Helpful (3)
      • December 18, 2016

        4 2005 GT - Bake Installation Time: Afternoon

        X-force for 2005 mustang gt

        Very nice polished stainless finish. Well built. All welds are perfect. Mufflers are an easy install. Nice tone in quiet mode and loud rumble in bypass. Only issue was that the clamps for inlets weren't good enough to clamp securely. These were replaced by american muscle at no cost.

        Helpful (5)
      • November 09, 2016

        3 2007 GT - drkpssngr

        Goes from quiet to quieter

        With stock cats this will make your car go from quieter than stock when closed to back to stock when opened. So I decided to get an off-road H-pipe. Now it will make your car go from quiet as stock to maybe just a tab bit louder than stock. With the ability to control the volume they should of designed it to be louder when opened. Also for $800 mufflers they sure take some effort to fit right. Was able to get passenger side centered but the ota still bangs on the chassis brace time to time. The driver side side a bit towards the left and the pipe hits the brace all the time.

        Helpful (6)
      • November 09, 2016

        4 2005 GT - ElCajonBone24 Installation Time: Less than 1 Hour


        They look great and work very nice. Wish there was a button to install on dash, easier access while in the car. Wish wide open was a bit louder but overall great product.

        Helpful (3)

      Questions & Answers (12 answers)

      5 Top Rated Questions

      If I have a the true dual pypes v6 conversion kit, would this exhaust fit that?

      • If you have the True Dual Pypes V6 conversion kit, this axle-back exhaust system would work for your vehicle.

      Helpful (1)

      Good day I have got a Shelby GT500 m.y. 2007, I think this "back exhaust" can also be installed on my car, Is it correct? Many thanks for your reply Best regards Marco (from Italy)

      • his Varex Axle-Back Exhaust is designed as a direct fit bolt-on upgrade for the 2005 to 2010 GT Mustangs equipped with the SOHC 4.6L Modular V8 engine. This exhaust will NOT fit the 2007 GT500 Mustang.

      Helpful (0)

      I currently have a Borla cat-back Stinger exhaust. With the addition of new cams this year, the Stingers are just too loud. Will these bolt up to the Borla pipes on a 2005 GT?

      • You can use this exhaust with the Borla cat-back. However, you may have to do some modifications with the exhaust due to the different brands.

      Helpful (0)

      I currently have a Borla cat-back Stinger exhaust. With the addition of new cams this year, the Stingers are just too loud. Will these bolt up to the Borla pipes?

      • As long as the Borla are the same size as the factory exhaust, this should bolt right up.

      Helpful (0)

      I am interested in this type of adjustable exhaust for my 2007 Roush Stage 3, but obviously this isn't a bolt-on exact fit. Does AM offer a version of this for Roush owners?

      • When it comes to the exhaust, if it is designed to fit a GT, it will also fit your Roush!

      Helpful (0)
      Post Your Question
      7 More Questions
      So are there any gains in power with this or is this just for control over sound ? 1 answer
      How loud would these be in a convertible? I love the exhaust videos AM does for the mustangs, just wish a convertible was used in testing from time to time. 1 answer
      What will happen if I put this exhaust on my GT500 cause I seen a video we’re a person put this muffler on the GT500 ? 1 answer
      Has anyone put these on a 05 V6? If so how does it sound? I’m looking for deep and loud but quite it down in my neighborhood 1 answer
      Could you please provide a video to add to this listing? Thank you. 1 answer
      will these fit the 08 gt500? 1 answer
      Is there a slight chance of this product fitting a Mustang V6? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Passenger side muffler assembly
      • (1) Driver side muffler assembly
      • (2) Exhaust Hangers
      • (1) Control Module
      • (2) Key FOB's
      • Control Wiring Harness

      Tech Specs

      Axle-Back Exhaust Specifications
      Piping Material:Stainless Steel Tip Material :Polished Stainless Steel
      Piping Size:2.5"Tip Size:4"
      Muffler Type:ChamberedFitment:2005-2010 GT

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