[rich weyand]

I don't really know, but I don't think so. A 3" exhaust will flow almost 800 cfm, and a 454 at 5000 rpm only flows 650 cfm, assuming an ideal volumetric efficiency of 1.

Then again, 2.5 pipe is not enough, and I think 3 is the next size up. I would use 3" on a single exhaust for a 454.