I was wondering if there was any difference between an LS, GSR, or ITR oem exhaust. You know flow rate or piping size. And which one do you guys think is better. Thanks.

 

difference in all 3, gsr flows better than LS, ITR flows better than gsr. If youre looking for a quiet non-restrictive exhaust, look into the apex'i world sport... almost stock looking, quiet. you can also weld an itr tip on the ws muffler

 

ITR flows the best.................but u r definitely gonna pay some bux for it

 

as far as i know they should be mostly the same, never really compared an LS vs. ITR stock exaust. if anything i would think maybe the cat. conv would be. but i usually dont crawl under anything but my car.