i have fms shorty headers, bbk o/r xpipe, and a borla catback (unsure of what type) it had a bassani catted x-pipe on when i bought it and i switched to the bbk. after i installed it, it sounded like it was leakin. it backfires more than normal when coming down in rpm's. it did not do this with the bassani piece in there. i was lookin at the connection from the bbk to the borla c/b and it doesnt look like it fits well. the diameter of each pipe is identical and doesnt "slip" over one another. i just took it to an exhaust shop today to see if they could find it and all they saw was that the passenger side header to mid pipe bolts were lose. on the way home, it seemed like the leak was gone but started it up a couple hours after i got home and the leak reapeared as worse as before. has anyone else had this problem?