I got it honed at Extrude Hone in Paramount, Ca. There is no way I will be able to tell you if the Extrude Hone made a difference by itself. I've made too many changes all at once. I'm going from a stock motor with an Edge programmer to a So Cal built and balanced motor with rods, pistons, cam, ported heads, billet wheel, RDL headers, Air Dog lift pump, Wicked stg 3 CP3, Exegry sticks, and EFI Live. Oh, and some a few Extrude Honed bits also. Just too many changes to single out any one of them.
But the honing definately cleaned things up inside the cover.