Bulls**t. Do you have a flow bench to prove it? Pipes only flow as much as their narrowest point, which happens to be the same spot on all of them; the flange, and the 90* bend there-after.
PS: What the hell do you need 600HP on the street for? Where are you going to responsibly let that loose? C'mon man, be realistic.
Keep it neat on the street, fast on the track.
