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The key to the Varitune muffler is the adjustment screw located on the back of the muffler. By simply moving that screw in or out exhaust gases and sound waves will take a different path. Fully closed the mufflers act as a three-chamber design offering tone and rumble that is louder than stock with less cabin noise, making them ideal for long commutes or road trips. With the adjustment screw backed all the way out to the open position, the Varitune mufflers become a wide-open design giving the car a louder (up to eight decibels), more aggressive exhaust note, and maximizing power gains found in the mufflers.
BBK offers the Varitune mufflers in a variety of offset configurations and sizes including 2.5”, 2.75” & 3” pipe diameters. BBK is currently developing complete cat-back exhaust systems for 79-2014 Mustangs that will include the Varitune mufflers. For now you can order the muffler in the size and offset configuration if you’d rather not wait for the complete system. The Vari-Tune mufflers are available in a stainless steel or aluminized casing and are sold individually. BBK recently announced that axle back systms are available for 2005-2014 Mustangs as well as 2010-2014 Camaro SS, 2003-2012 Charger V8, and 2008-2013 Challenger V8.
BBK’s Varitune mufflers offer Mustang owners the best of both worlds. The Varitune muffler is a truly tunable piece with adjustability for the sound level. BBK demonstrates the Varitune in the video (link below) on a Mustang GT that has also been modified with headers and an off-road X-pipe.
PART Number and Description
3101 Varitune Muffler - Aluminized - 2-1/2" Offset / Offset
31015 Varitune Muffler - Stainless Steel - 2-1/2" Offset / Offset
3102 Varitune Muffler - Aluminized - 2-3/4" Offset / Offset
31025 Varitune Muffler - Stainless Steel - 2-3/4" Offset / Offset
3103 Varitune Muffler - Aluminized - 3" Offset / Offset
31035 Varitune Muffler - Stainless Steel - 3" Offset / Offset
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