I'm interested in getting one but I was wondering if they will only fit stock or MAC headers and nothing else? I gotta believe if a P/C will fit stock headers it would fit just about any shorty out there since most shorties are made to fit up to a stocker H. Does anyone have one hooked up to BBK's right now? Right now I'm rockin equal length BBK shorties with a BBK H and a MAC catback. I basically want to swap out the H for a prochamber if I can and then put some cats on the BBK and use it to pass emissions when I need it.