(approx) 1 Hour
Light to Moderate mechanical skill required.
Hey I’m Justin with AmericanMuscle.com, 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 support@AmericanMuscle.com, 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.
Subscribe to our YouTube Channel
Features, Description, Reviews, Q&A, Specs & Installation
Fitment: 2005 2006 2007 2008 2009 2010 Details
CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
January 25, 2019
LOVE THE SOUND
THIS IS AWESOME. LOVE THE SOUND. YOU CAN ADJUST THE SOUND YOU WANT. WOULD RECOMMEND BUYING ESPECIALLY SO YOU CAN MAKE IT SOUND LIKE YOU WANT.Helpful (2)
October 10, 2018
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
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 painfulHelpful (4)
March 25, 2018
i had flowmasters with no miles on them thay came apart.so 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
Great for the money
Great mufflers this axel back system really made my 2006 mustang v6 sound greatHelpful (6)
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!!!!Helpful (7)
June 10, 2017
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
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
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
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 spacersHelpful (7)
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.
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.
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.
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.
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.
(approx) 1 Hour
Light to Moderate mechanical skill required.
What's in the Box