HM: 5 Zigen Pro-Racer (A-Spec) light weight stainless steel street/race catback for S13/S14 1989-98 240SX. Pro-Racer catback is different from your average catback by incorporating 80mm turbo piping with special unique inconel exhaust tip. In addition, the catback has been dyno proven to flow so well also on non-turbo 240SX which mashed down 12-15rwhp on the dyno by adding on this catback! More gains to be achieved on turbo applications. Despite the superior flow of the catback, the noise level is severly quiet compared to others at under 93 decibles! (Normally legally permitted is 95 decibles).