Eric, the BMW 2.0L is saddled with a 2% weight penalty because Americans wouldn't buy it so BMW didn't sell it here. That k20 in an s2000 or nsx would be a lot closer to a bmw in weight, too.

And read up on prod. The VAST majority of cars allowed in both P and ST are prep 2, with stock pickup points and the same head prep, and usually 11 or 12:1 cr and 0.400ish cam. So... Not that different.