Quote:
Originally Posted by SD455DJ
You'll be fine with the 2.25" outlets. My stock 455HO did pretty good on the dyno (430 hp @ 4900 rpm/535 lb-ft @ 3500 rpm) with factory original RA manifolds with 2.0625"/2.125" outlets, so your larger outlet RA manifolds will work fine on your 400.
Dennis
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Did you have to grind down the lip of the head pipe that connects to the manifold? Mine is wider than the flange bolts.
My first exhaust job and want to do it correctly!