Nytromchi
Newbie
Has anyone done a dyno with MBRP against a stock exhaust. Wondering what actual hp gains if any or if the aftermarket exhaust may lose hp due to these engines needing backpressure to make power.
shadow44
TY 4 Stroke God
Are you talking about full header/muffler? MBRP will probably flow better than stock but the header uses small primaries...I'm guessing the full system would gain 6-8 hp at best. I've compared it to the Hindle header side by side....it looks stock in comparison.
