He is kinda right. But also the longger you can keep the exhaust warm-semi hot The better it will flow Sooooooo???? I have heard( if the exhaust is made smaller as it goes back The warmer the exhaust stays)
But personaly to me it sounds as if your motor is still pretty much stock. So you don't need a 2 1/2 all the way back to start with.
God doesn't like ugly.
