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BBK Varitune Axle-Back Exhaust - Stainless Steel (05-10 GT)

Item 56239
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      Review & Installation Video

      Hey I’m Justin with, here with quite possibly one of the most exciting new products to come along in some time, I’m talking about BBK’s Varitune fully tunable axleback exhaust system, fitting the 2005-2010 Mustang GT. If you haven’t checked out BBK’s complete lineup available for your Mustang, just click the link below to head back to our site, and see for yourself. Let’s break these mufflers down a little further, the Varitune as the name suggests is a fully tunable muffler, allowing you to adjust not only the sound but also the performance. How does it all work? Well, BBK was kind enough to send along the internals of one of these mufflers, to show you how it all goes down. By adjusting this screw on the outside of the muffler, you can change from a 3 chambered muffler to a single chambered muffler in a matter of minutes. With the power valve closed like it is now we are essentially running a 3 chambered muffler, which is going to keep the sound levels down considerably. By turning this screw and opening the power valve complete, you are transforming that 3 chambered muffler into a single chambered muffler, allowing the exhaust gasses to bypass those first two chambers complete, before being dumped in the third chamber and exiting out the tip here. During our actual testing, not only did I notice the tone to be slightly louder with the valve open, but it also took on a more aggressive tone. What I mean by that is it had the tendency to grumble and pop a little bit more coming down off the revs. BBK does offer an aluminized steel version, in addition to a full stainless version of the Varitune, with a slight difference in price between the two. In addition to that the kit does feature 3” mandrel bent tubing, in addition to these 4” brightly polished tips. There are 4” black tips available from a dropdown menu, if you’d just like to switch up the look a little bit. Installing the Varitune is just like installing any other axle back exhaust, it can easily be done in about an hour’s time using basic hand tools. Adjusting that sound tube is even easier and can be done using a wrench in about a minute of your time. If you have any questions about the install, or about the Varitunes in general, get in touch with one of our customer service reps, you can email them at, or give them a call at 855-422-7439, and if you haven’t done so already, go ahead and subscribe to our YouTube channel by clicking the link below, or up in the corner. We have hundreds of exhaust sound clips that you can hear, that might help you with your purchase. Now let’s hear how the Varitune sounds on our GT with the valve fully closed and fully open.

      Product Information

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


      • BBK Varitune Axle-Back with "Adjustable Power Valve"
      • Change from a Three to One Chamber Exhaust for More Power and Sound
      • 8-10 Decibel Range Difference
      • Stainless Steel Construction
      • 4" Polished 304 Stainless Steel Tips
      • Direct Bolt-On, No Cutting or Welding Required
      • Fits 2005-2010 GT and Bullitt Mustangs


      Adjustable Sound. This BBK Mustang Axle-Back Exhaust system features BBK's patented tunable Varitune performance mufflers that allow you to change from a mellow three chamber exhaust sound to a rich throaty straight-through exhaust note with just a twist of a wrench, for a 8 to 10 decibel sound level difference!

      How It Works. BBK Varitune performance mufflers utilize an internal "Adjustable Power Valve." When in the closed position the valve blocks the exhaust flow, forcing it through all three chambers of the muffler for a classic mellow sound. When in the open position, the valve "uncorks" the exhaust flow, allowing it to take the path of least resistance, acting more like a straight-through muffler for a rich throaty exhaust note. This unique design is perfect for personalizing the power and sound levels of your Mustang to suit your own specific needs.

      Stainless Steel Construction.
      Constructed from highest quality Stainless Steel available, this BBK Performance Axle-Back exhaust system features Varitune chambered mufflers that end with 4" polished 304 stainless tips for impressive looks and sound. The tips exit in the stock locations so no modifications are required to the rear bumper cover.

      Application. This BBK Varitune Axle-Back Exhaust is designed as a direct fit bolt-on upgrade for the 2005-2010 GT and Bullitt Mustangs equipped with the 4.6L 24V SOHC Modular V8 Engine.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 41005

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (17)

      Write a Review

      Ratings Summary

      4.4 out of 5 overall rating from 17 customers

      Installation Time: Afternoon

      Installation Cost: 0-$100

      • January 25, 2019

        5 2010 GT - DustinL Installation Time: Afternoon



        Helpful (2)
      • October 10, 2018

        2 2007 GT - PhillipK Installation Time: Afternoon


        Put these on a 2007 Mustang GT. Left the cats and resonators on. The drone is almost unbearable between 1600-2100 RPM. Speeds below 50 is OK and above 65 is OK, but between anywhere in between you can't carry on a conversation nor hear the radio.

        Helpful (4)
      • October 08, 2018

        3 2010 GT - ThreeJ Installation Time: Less than 1 Hour

        one bad spot

        easy install great sound at idle but no matter where its adjusted to at 1500 to 2000 rpm when pulling the note and vibration are almost painful

        Helpful (4)
      • March 25, 2018

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

        2005 gt

        i had flowmasters with no miles on them thay came i am trying bbk varitune axle back. so far seem good good exhaust note,and if i wont to change it all i need to do is turn a bolt out.

        Helpful (6)
      • November 23, 2017

        5 2006 V6 - EthanM Installation Time: Afternoon

        Great for the money

        Great mufflers this axel back system really made my 2006 mustang v6 sound great

        Helpful (6)
      • June 17, 2017

        5 2010 GT - Cougar0666 Installation Time: Shop Install

        They sound great!!!!!

        I like how you could adjust the sound and the noise the best thing is you have to have the complete exhaust system for performance pricey but I thing it is the best mufflers you could buy!!!!

        Helpful (7)
      • June 10, 2017

        5 2010 GT - Prince53

        I love them

        Nice race car sound there amazing quick easy install would do it all over again much love❤️

        Helpful (6)
      • April 29, 2017

        4 2006 GT - P51DRIVER Installation Time: Less than 1 Hour

        Go Law-abiding to Outlaw in Five Minutes

        Innovative valve allows for adjusting your exhaust note from "responsible citizen" to "outlaw" in just five minutes. Everything in the kit fitted well; however, I had to modify my hitch receiver to make it work. If I didn't have one, install would have taken less than an hour. But, one demerit for the exhaust tips' appearance: The interiors are visibly clunky and draws attention away from the polished exteriors. A 1/4" impact driver for tightening clamps is desirable.

        Helpful (6)
      • June 07, 2016

        4 2009 GT - NitrousNewton Installation Time: Less than 1 Hour

        Nice quality!

        Great quality. I have full BBK exhaust; Headers, Catted X-Pipe and these mufflers. Car is loud with the mufflers capped off and REALLY LOUD with them opened up. Looking forward to testing at the Drag Strip. Tim Newton Auto Sales Inc.

        Helpful (7)
      • January 18, 2016

        3 2006 GT - Poncho Installation Time: Full Day

        Clamps too large l.

        69.9 mm clamps were too large to tighten muffler to pipe on both sides. Bbk technical could not help I had to make clamp spacers

        Helpful (7)

      Questions & Answers (5 answers)

      5 Top Rated Questions

      Do you have any info (such as loudness and tone) on the Varitune Axle Back's paired with the BBK long tube headers and the bbk off road x pipes?

      • The BBK Varitune Axle-Back Exhaust are adjustable which will have a small effect on overall tone, and a large effect on exhaust volume. Because of this it is hard to give a good indication on how the overall volume will be, especially with other exhaust components such as long tube headers installed.

      Helpful (0)

      Does the car in the video have stock headers and cats? Looking for exhaust that has this sound with stock headers and cats.

      • The car in the video would be the stock cats and headers yes.

      Helpful (0)

      Do the exhaust tips come off, so I can replace them with roush tips?

      • The exhaust tips on the BBK Varitune Axle-Back Exhaust are welded on.

      Helpful (0)

      Will this product fit the BBK True Dual Exhaust Conversion Kit for my '08 V6?

      • Hi, This axle back will work with the BBK True Dual Exhaust Conversion Kit.

      Helpful (0)

      Any issues fitting to a GTCS rear facia?

      • The BBK Varitune Axle-Back Exhaust - Stainless Steel (05-10 GT) will have no problems fitting up with the GT/CS rear end.

      Helpful (0)
      Post Your Question

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Passenger side muffler assembly
      • (1) Driver side muffler assembly

      Tech Specs

      Will It Fit My Mustang

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

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