Recently Tech Editor KJ Jones at 5.0 Mustang & Super Fords Magazine was the first lucky editor to get his hands on an actual 2011-14 Mustang GT BBK Varitune performance axle back exhaust kit for some testing. KJ took the kit over to a local Mustang specialist GTR Hi Performance in Rancho Cucamonga California to do the install and test at their facility.
The kit was installed on a bone stock 12 Mustang GT 5.0 and from the results we see here in this article from the 5.0 Mustang & Super Fords October 2013 issue it looks like this BBK Performance Varitune axle back system picked up a solid 10 Horsepower and 10 ft/lb torque at the rear wheels!
Take a look at the great range of sound adjustment they were able to obtain as well, Check out the DB readings at the various settings they used.
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This independant test proves that these Varitune mufflers are not a gimick - they are the real deal, Check out the BBK Performance Varitune mufflers on our website Here - the Axle back kits and cat back exhaust systems will be available in the new year