most people dont run the rear power valve. those are some pretty big jumps in the jets. like the dude said it shouldnt have needed much going from one engine to the other. what is your cruise afr? what power valve setup are you running? are you sure its working?
im running a blowthrough. i like it. if i had the money i would probably go with one of the easy efi setups. the self learning ones. a couple of them are setup to handle boosted applications. i think the max is only 2 bar though.
