#13

11-21-2022, 11:17 AM

KSZR

Senior Member

Join Date: Nov 2022

Location: Iowa

Posts: 170

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

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!

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