hello i race whit these guy he had a 200sx SER J Specs he had a 3" catback Vs honda cicvic SI all that i have is cold air intake .......... but let me tell ya these guy took me for2 cars itstht possible........ if i do a catback in my car it will make a differnce ????????????????

SER SI

japanese engine B26A2
catback 3"
stage 2 clutch