can someone direct me to the right link. i bought a used go .21 5 port turbo. that was run on 30%, i want to run it on 20% cause thats all have. but i need to khow how many shims it should have for 20%.i want to download the manual but i couldnt find it. or if any one have the shim info i would really aprecciate it. also what turbo plugs does this engine do best with. thanks.