Ford Mustang Varitune Cat Back Exhaust Kit 86-04 PART #3001 FEATURES: Direct Bolt On 2-3/4" CNC Mandrel Bent Stainless Cat Back Exhaust Kit For The Ford Mustang Kit Includes Stainless BBK Varitune Mufflers With An Internal Power Valve That Allows Fine Tuning of Sound and Power Levels Change From One to Three Chamber Muffler by Turning a Wrench Large 2.75" Mandrel Bent Stainless Tubing for Maximum Flow 8-10 Decibel Range Difference 3.5" Stainless Steel Tips VEHICLE FITMENT: 1986 Ford Mustang Mustang GT 1987-1993 Ford Mustang LX 5.0L, Cobra 1994-1998 Ford Mustang Cobra 1994-2004 Ford Mustang GT 2001 Ford Mustang Bullitt 2003-2004 Ford Mustang Mach 1 Does Not Fit 1999-2004 Cobra with IRS One-of-a-Kind Adjustable Catback The BBK Varitune Stainless Cat Back Exhaust Kit for 1986 Mustang GT, 1987-93 Mustang LX/Cobra and 1994-2004 GT offers full tuning ability with BBK's patented adjustable power valve. That's right, these unique systems come complete with two patented tunable Varitune performance mufflers engineered with high-flow, direct fit 2-3/4" tubing and hardware for an easy bolt on installation. Each system also includes a pair of stylish 3.5" stainless tips to deliver good looks in addition to maximum performance. Adjustable Mufflers? These American designed and built performance mufflers are the first of their kind in the aftermarket fully adjustable performance mufflers that can be adjusted for sound and horsepower by simply moving the adjustment screw in or out from underneath the car! BBK Varitune performance mufflers utilize a unique internal power valve. When in the closed position the valve blocks the exhaust flow, forcing it through all three chambers of the muffler for a classic mellow sound. When in the open position, the valve opens the exhaust flow allowing it to take the path of least resistance, acting more like a straight-through muffler for an aggressive throaty exhaust note. Installation BBK Varitune exhaust kits are engineered and built with large 2-3/4" CNC mandrel bent Stainless tubing for unrestricted exhaust flow. These kits are direct fit and include all hardware required for a true bolt on installation.