I've been hearing a lot about back pressure, and I was told from a friend that I was getting too much of it... So I'm planning on getting a exhaust system but I'm not sure size. My v-tec is cracking at a higher rpm which is around 6000rpm red-lines at 8000, but don't wanna go too big for concerns about when shifting around the lower rmp... Need advice (please insight)

 

Backpressure: The Myth and Why It's Wrong ..... and unless you are going boosted, 2.25-2.5" pipe is all you'll need...

also.. search....