Question, if the dyno can lie then how you going to know for sure what headers make the most power? Isn't true that a to big of a header tube hurt cylinder scavenging?
Because you dont just look at the power numbers and you don’t let the dyno lie to you.
And no, too big a header won’t necessarily over scavenge the chamber. Look at valve overlap because that has far more affect on combustion chamber scavenging than a header does, BUT you can kill header function with incorrect cam timing.
