str8edgexx is exactly right. Just get the 5zigen border axle back or the thermal stealth axle back. both are nice looking (not a huge tip) and the gains would not be noticable with a catback anyway so why bother. Also, a friend of mine has a JRSC D16Z6 and he gained 8HP by putting the stick exhaust system back on. Go figure, the JRSC made more HP from the increased back pressure.