I own an 89' 325is with a 2.5L M20 I-6. I'm thinking of turbocharging it, but I don't have the cash to reinforce the enternals of my M20. There is a company that has a supercharger system thats states that it would add up to 85HP!!! Question is, do I have to do the same with the enternals with this mod??? Let me know.