hey guys im going to get the prospeed header pretty soon. well i called them up he told me that im going to have to have a machine shop put a flange to connect the header with the cat can someone explain to me what he is talking about and what is a rough price they will charge me to do that? thanks guys

 

the header comes without a flange on the end of the pipe. So you need to go to a muffler shop, and have them weld the correct flange to mate up with the rest of your exhaust system. If i were you id have the shop change to 2.5inch exhaust while your there considering the header is already 2.5 at the collector. Depending on how much they charge for time/labor. its about 3 bucks for the flange.