I'd buy a downpipe anyways... the stocker is crap.ergodyne5 wrote:how would the new after market cat-back fit the catalytic coverter if the the after market exhaust is 80MM in diameter? Just asking because I just purchased an SILVIA front-clip ,and it just arrived today. I also bought the Tanabe super racing medallion and I don't know if it will fit or will I have to get a down pipe with a test pipe or catalytic converter?