People here are talking about forced induction, and you guys are worried about tranny stress? Not nearly enough to make a difference.
Im curious if the 328 is either :
a tuned up 325 (single stage manifold) or
a tuned down 330 (3 stage manifold)
This is still for sale. If you have a 325, and really want some more power, this the only way to fly. ECU is about 900, so you are talking $1500 total, which is pretty cheap for BMW horsepower.