Tweetthe s54,is very delicate as u know and there little room for modification thus caution must be taken when modding ,the compression is so high and and the motor is high strung ,so as u see ur kind limited ,without opening it ut ,and replacing internals,no supercharger or turbo,bur u can get about 420 natural aspirated out of it and if u lughten her about 300 lbs then ur spankin zo6 s.5im in the process of converting her to ALPHA N ,