Mac Pro Chamber H-Pipe with Cats for Stock Replacement, 1999-2004 GT & 1999- 2001 Cobra. For the GT or Cobra that needs a replacement catalyst, this pipe not only has mandrel-bent 16 gauge tubing, but has Free-Flow catalytic converters for better breathing! These pipes are designed to merge exhaust pulses to create higher temperatures. This boosts exhaust velocity, forcing exhaust to see both outlets. Fits from the headers to the intermediate pipes. Use only with MAC or OEM components for best fit and performance. |