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.
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
