Quote:
Originally Posted by SSearchVT  Pulse timing and scavenging are only two of many variables that affect the efficiency or performance (they're not necessarily related) of engines. |
All said above by SsearchVT is probably the most accurate of statements made during this whole discourse. From what I know reduced back pressure is a player, but a lesser one and one of many.
I think if you put a 1 HP shop vac in blower mode to the intake and of an exhaust it would blow through pretty easily, even a "tight" stock exhaust. It's not like you're using up gobs of HP forcing air through teh DOT pipe that you suddely win back when you take a sawsall to the muffler.
It's all very much like mods were people drill their stock airbox or install individual filters. Sure, the restriction goes down but the other effects are destroyed and the dyno chart suffers.