This H-Pipe section for the 99-04 Mustang Cobra / Mach-1 is for those who already own an American Racing Header system with the X-pipe that want to run an H-Pipe. It will re-use your catted or offroad leads which you already have and convert it from an x pipe to an h pipe. Product Features: H-Pipe Section ONLY Bolt-On Requires No Cutting or Welding T-304 Stainless Steel Construction Mandrel Bent Tig Welded Made in the USA Does Not Include Offroad or Catted Lead PipesLearn More