Optimize your exhaust flow with a Pacesetter Performance H Pipe. Cross-over pipes have been shown to deliver more power and a more powerful sound from your Mustang. This item works specifically with 2005-2008 Ford Mustang GT 4.6 models with Long Tube Headers (part 70-3232) to connect to your existing exhaust system. It comes with catalytic converters integrated right into it! The part number for this item is 82-1123 and it fits 2005-2010 Ford Mustang GT 4.6 models that are using Pacesetter Long Tube Headers. If you are not using Pacesetter Long Tube Headers, this item will not fit.