The stock KA exhaust pipe size is 2". Running a 2" pipe with an SR under boost will present more exhaust restriction. 3" piping is the way to go.triple8zn wrote:i have the stock motor for my 96 240sx and i want to buy a exhaust but was wondering if it would fit on my motor and the sr20 motor if i did a swap. i plan on doing it later. i was going to get a cat-back exhaust.