1986-2004 MUSTANG GT LX COBRA VARITUNE FULL CAT BACK EXHAUST SYSTEM SS TIPS 1983-pontiac-firebird-esi2278290 BMR Suspension has taken the

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1986-2004 MUSTANG GT LX COBRA VARITUNE FULL CAT BACK EXHAUST SYSTEM SS TIPS 1983-pontiac-firebird-esi2278290 BMR Suspension has taken theBBK Varitune cat back exhaust systems feature BBK Varitune mufflers that have a patented adjustable power valve inside that allows full adjustment of the exhaust flow through the mufflers chambers for a great sound and added performance. This adjustment is made at the rear of the muffler with a wrench by either moving the valve in or out. Once you are happy with the level of sound, it is locked in place with the Varitune locking nut. All of the