the more likely it is that the lion's share of ur activity with ur ride is goin to b street with exhaust in place the more advantageous it is to use the maximum amount of cubes that u can reasonably fit into the ride.....IE, a 500hp small block will not make the tq of a 400hp big block n in drag racin tq and application of same is what accounts for a quick et, hp will account for mph, but on avg u need 50 more hp and the susequent mph increase to overcome a 25lb/ft tq shortfall....