MAC Stainless Pro-Chamber Off-Road H-Pipe, 2 1/2" for 1999-2004 Mustang GT and Cobra with Shorty Headers. This Pro-Chamber H-pipe is made from mandrel bent stainless 16 gauge tubing, and merges exhaust pulses to create higher temperatures. The result is a boost in exhaust velocity, forcing exhaust to both outlets. Fits from the headers to the flow tubes. Since there's no catalytic converters, there's more power. Not emissions legal, off road only. Use with MAC or stock headers for best fit. |