[K10Scottsdale78]

Originally Posted by y5mgisi

Actually, Dual 3" is wayyyy to big for your 400! For 3" duals you better be paicking a big, big block at over 500hp.

http://www.exhaustvideos.com/faq/how...pipe-diameter/

Really? I see the newer 2500HD silverados and their exhaust looks huge for a 6 liter. My neighbor drives one and the pipes on his truck look massive compared to mine. So I figured if my truck has a higher displacement, that it would be better with bigger pipes. So would a 2.5 work? I just think that 2.25 seems way too small for a 6.6L gas job.