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

Market Price $632.49 You Save 13% ($82.50)
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  • Item 56239
  • MPN# 41005

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Features, Video & Details

  • 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

Review & Installation Video

Review & Install 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.

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

What's in the Box
  • (1) Passenger side muffler assembly
  • (1) Driver side muffler assembly
Installation Info
Tech Specs
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

Most Helpful Reviews

Great product made in the USA

I am 60 years old and installed these in a couple of hours with out lifting the vehicle. Don't even start this job if you don't have an impact wrench!! unless you want to take it to a muffler shop to tighten ...

Read More
Helpful (1)

Varitune Power

These mufflers were installed by Muffler Man for $100.00, they had never seen anything like them. I had them put the mufflers on the one chamber straight -through "open" position, I will probably never ...

Read More
Helpful (1)

Overall Rating 4.6 out of 5 stars
Read All 13 Reviews

Customer Photos (4) Submit Your Photo

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5 Questions / 5 Answers

Ask a Question

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.

    Rob D

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.

    AM MikeW

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.

    Chris J

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)

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Customer Reviews (13) Write a Review

Overall Rating 4.6

out of 5 stars

Installation Time:Afternoon

Installation Cost:0-$100

  • Loudness / Volume 4.692307 4.7
  • Exhaust Note 4.846154 4.8
  • Fit & Finish 4.692307 4.7
  • Bang For Your Buck 4.769231 4.8

  • 4/5

    Installation Time: Less than 1 Hour

    June 07, 2016

    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.


    Year: 2009 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Full Day

    January 18, 2016

    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


    Year: 2006 Submodel: GT Decatur, Tennessee

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 01, 2015

    Great product made in the USA

    I am 60 years old and installed these in a couple of hours with out lifting the vehicle. Don't even start this job if you don't have an impact wrench!! unless you want to take it to a muffler shop to tighten the clamps all the way when your done. You can pick up an electric impact wrench at Harbor Freight for $39.00 with coupon that you can download. These sound great open or closed however if you are going on a long trip you might want to close them. I didn't have to loosen the mid pipes because i removed the brackets a little hard to get at but doable if you have the right tools (ratcheting box wrench's 13MM and 15MM). Fit great and sound great and look awesome. I highly recommend these.


    Year: 2005 Submodel: GT Tarpon Springs, FL

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    September 19, 2015

    BBK Varitune review

    Installation took just under 2 hours from start to finish. Installed using jackstands no lift. Relatively easy install... had some issues with rusted hanger bolts. Fit-up was good, tips look great. Only thing i have a slight issue with... its pretty darn loud on highway driving. Especially while running around 2k on the tach. But i just close the damper and its fine for long drives. Overall, I'm very happy with the exhaust. Would recommend to other buyers.


    Year: 2007 Submodel: GT Maryland

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    August 27, 2015

    Varitune Power

    These mufflers were installed by Muffler Man for $100.00, they had never seen anything like them. I had them put the mufflers on the one chamber straight -through "open" position, I will probably never change them! These have an aggressive "grumble" at idle and a smooth "throaty" increase as you move through the gears (manual). They sound aggressive but not over the top, my mustang now sounds like it looks! The polished tips are wider but fit right in the same hole as the stock muffler tips, and they look awesome, like they should! A comfort knowing that if I wanted to sell my mustang I can switch to the mellow sounding three chamber configuration with an adjustable wrench!


    Year: 2008 Submodel: GT Flint, MI

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    May 24, 2014

    great sound, and adjustability

    I recently bought my first Mustang, a 2006 GT. When I got it, it already had after market mufflers, but the stock mufflers were also included. Although I liked the sound of the car, the mufflers were just too loud for me so I installed the stock mufflers. I liked that they were quiet, but I wanted a better sound, something in between the two sets of mufflers that I had. I narrowed down my choices to three different models and decided to go with the Varitune mufflers since they offered adjustability. I am happy with the sound. They are louder and sound better than stock without being crazy loud. They give the car a nice rumble but are not overly loud when at cruising speed. At this point, I have not yet even opened them up, but I will most likely do this when I take the car to the track to get a little more power.


    Year: 2006 Submodel: GT Pittsburgh, PA

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    November 23, 2017

    Great for the money

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


    Year: 2006 Submodel: V6

    Helpful (0)

  • 5/5

    Installation Time: Shop Install

    June 17, 2017

    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!!!!


    Year: 2010 Submodel: GT

    Helpful (0)

  • 5/5

    June 10, 2017

    I love them

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


    Year: 2010 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Less than 1 Hour

    April 29, 2017

    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.


    Year: 2006 Submodel: GT

    Helpful (0)

  • 5/5

    Installation Time: Less than 1 Hour

    November 22, 2015

    Baritone by BBK

    Fantastic and ingenious system. Sounds great and is easy to install. The SS version is the way to go in the wet, great NW and any other such states where rain is a factor to consider re rust. Thanks again for the great service AM!


    Year: 2007 Submodel: GT Olympia, WA

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    June 12, 2015

    The BBK varitune mufflers

    I have yet to have them installed but like every thing else BBK makes i have absolute faith in them and i believe they will definitely enhance my horse power as well as the sound factor also ilike the idea of varitune because with that I can use it on the street without any worries and then if and when i take it to the track i can make them almost a straight thru pipe which should enhance and increase the rear wheel HP by a bit yes I would recommend them for any car for the factors i wrote about them above


    Year: 2007 Submodel: GT aldan, PA

    Helpful (0)

  • 5/5

    Installation Time: Afternoon

    May 23, 2014

    BBK Varitune Axle-Back Exhaust

    The 2 things I think about when looking at adding or changing parts to my Mustang are. 1. Is it worth the price and 2. will it improve performance and or looks. These Varitunes did both, it was not cheap at $519.99. (I Paid $509.99 I found a $15.00 coupon) The installation: The only problem I had was getting the clamps tight enough on the passenger side. I really had to put some muscle into it to get them tight enough not to move. I really like the looks of the tips, just what I wanted NOT FACTORY, The Sound is great. opened or closed. BUY THESE.!!!!


    Year: 2008 Submodel: GT Klamath Falls, OR, USA

    Helpful (0)

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