Hey all, good project. I just got a 328xiT 6MT and I'm looking at some options... this looks promising! Coming from an e46 M3 has me wanting a bit more power, and I sure wish that NA would get the 335i Touring, but no such luck.
Anyway, from my brief look over this thread, it seems that even after the mani swap and 330i performance tune, the power level is not quite up to stock 330i levels, is this correct?
Obviously there are other differences. Do we know what these are? Exhaust? How about fuel pressure? Head? Is the block/head really identical on all N52 engines? Keep up the good work all ... I might join you in experimenting at some point, but I need to learn a bit about the e9x stills (I come from a racing background, but only built e36 and e46 race cars).