MARINE EXHAUST

[260 STINGER]

I WANT TO UPGRADE MY EXHAUST FROM 3" THRU HULL TO 4" THRU HULL. I'M TRYING TO PULL MORE RPM'S.MY BOAT HAS TWIN 325hp 350's,1.5 REDUCTION,SWINGING 24p MIRAGE PROPS. IT ONLY TURNS UP TO 44-4500RPM's,I'D LIKE TO SEE 5200rpm's. OK WHAT SHOULD I USE TO GET THE MOST PERFORMANCE

[Bondo]

Run a 22" Prop......

[Dennis Moore]

If you have Mercruiser exhaust manifolds you can simply install 4 inch elbows. More info on my web site www.mooreperformance.org (http://www.mooreperformance.org)

[260 STINGER]

IF I RUN 22p PROPS I'LL DROP ON TOP END! THAT'S NO GOOD.

[DansBlown73Nordic]

I put a set of Stelling stainless steel headers on my Schiada. It made a huge difference. I gained about 500 rpm,s and about 5-6 m.p.h. The boat pulls on top end much harder then before.
I don't think changing the risers will do a thing!!!

[260 STINGER]

ARE YOUR HEADERS WATER INJECTED OR DRY? HOW ABOUT THE NOISE ,ARE THEY REAL LOUD? HOW MUCH DID THEY COST?