Quote Originally Posted by Spinnetti View Post
Hmm.. the 325's seem to be cheaper to buy, and I suppose the build cost is about the same? Is extra weight in the nose not an issue? (I'm assuming 328 motor heavier?)
No heavier than the 325. The block and head are the same, only difference is the 84mm crank stroke. With the smaller port intake the hp is even close enough they should probably weigh the same 189hp vs 191hp. I know that Wiki data can be dubious but this article has a good comparison:

http://en.wikipedia.org/wiki/BMW_M50

James