A very well designed 21/2 system should allow a full 500 hp with zero loss.

Well, alot of us gear heads are not designers so we stick to the std. 3 inch system.

I myself run 3 inch magnaflows and pipes or 4 inch side pipes off the headers with modified inserts that can still be removed.

This has been rehashed over and over the years and the three inch seems better.

That dufuss on road kill, not steve D, but the guy whose always doing the redneck builds, beating on new parts, ect has a spot on the hotrod channel with back to back 2.5 to 3 inch systems (kits) I think and the 3 inch produces more overall.