I have an extra intake manifold in my garage that i was thinking about PnP it. I would use a set of Die bits. I would take the IM gasket and mark the IM and grind it donw till it matches, and i plan on doing it with the Throttle body too, I plan on using a B series TB. My question is will this give me a HP gains? I really dont want to take it to get down by a pro. If i do it will it mess it up? If u can help it will be great.