I have a 03 Cobra with a mac catback and catted magnaflow x pipe. I bought the bbk off a guy selling his 04 cobra for 125.00, brand new its like 220. I like the sound but its ear ringing loud, some people like their stangs loud like that but not me. I think the pipe will fit a mach1 as well but not sure, someone may want to chime in on that. I live around Kingston ny and trying to get 75.00 bucks for it, I just want it gone. The passanger side flange was taking off because the prior owners friend was going to try and custom fit it to another car but something happened and the guy just welded the flange back on. Besides that the pipe is mint and I know it definitely fits 03-04 cobra because I just had it on my 03. Thank you for any interest.