BBK 1511 1-5/8" Shorty Tuned Length Performance Exhaust Headers for Ford Mustang 351W - Chrome Finish BBK is your Number One Aftermarket Performance Exhaust Brand in the USA - American Designed and Built BBK Exhaust is Built with CNC Mandrel Bent Tubing for 35% Increased Flow Over Stock to Add Horsepower and Improve Torque and Performance Aircraft Quality Construction, Heavy Gauge 1-5/8" Tubing, 3/8" Laser Cut Flanges, Large Bore Patented Designed Collectors and Custom Precision Hand and Robotic Welds for Long Lasting Quality Direct "Perfect" Fit Replacement Exhaust Includes All New Gaskets and Hardware and Offers Improved Performance and Sound Over Restrictive Stock Systems Bolt on 12-18 HP with these 351 Swap BBK Unequal Length Shorty Exhaust Headers Fit all 1986-1993 Ford Mustang 351W Applications - Custom Nickel Chrome Finish