my exhaust system is 2 pieces, the downpipe is one piece, everything from there back is welded...the 3" cat is welded to the 3" pipe which is welded to the muffler. So I cant just get the pipe, i need flanges welded on the catback pipe as well. I have never been around a DSM with a dumped O2 housing, but I bet that its loud as hell, I dont feel like drawing that much attention to myself on the street.