After a slow initial start the new BBK Performance Varitune mufflers are now in production at the BBK performance manufacturing facility in Temecula California and should be available in stores soon as direct replacement mufflers for all Ford, GM and Hemi applications. The BBK Varitune Cat back exhaust kits and axle back exhaust systems will follow shortly after within a week or two. These all new high performance premium BBK Varitune performance mufflers allow you to easily adjust both the sound and performance levels of each muffler by simply adjusting the set screw with a wrench on the back of the Varitune muffler. Initial dyno testing has shown great results over other brand name mufflers, cat backs and axle back exhaust systems. BBK Performance have spent hundreds of hours of designing and testing this muffler design and they have utilized the adjustable chamber valve assembly design on these new mufflers to maximize the results that have also shown the ability to modify sound levels up to 8 decibels across the full adjustment range and adjust the power levels at the same time. These Varitune mufflers are the next HOT performance modification – stay tuned for more information and installation videos coming soon.