there may B an answ above by clicking on "Tech Archive" (if U haven't looked its a great place to spend some time). Matt uses the same pipes Mike W. did - ie CI (some say identical to the SD).
My recolection is 5-10% HP boost but yer well beyond that all now w/the nice alu head...

My recolection is 5-10% HP boost but yer well beyond that all now w/the nice alu head...
