What is the size of the stock piping on a s14? What size piping do you guys recommend with a apexi N1 single style exhaust to compensate with back pressure. I was thinking making it big enough then maybe adding the silencer to compensate for the back pressure. is that a good idea?

 

dont go any lower than 2.25, and dont go any higher than 3.00. try to get mandrel bent if you can.