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Originally Posted by bryan@mwerks
The N54 (turbo) engine weighs 419 lbs complete, compared to 357 lbs for the N52 engine, which in turn is 22 lbs lighter than the M52 engine it replaced. So despite its lightweight intentions, it's still heavier than the old 3 Series six by about 40lbs.
Remember that 300 hp/300 lb-ft is stock. I'm sure it will only be a simple matter of a chip to take that to 330-350 horsepower. BMW showed a Z4 Racer with a 400 hp/400 lb-ft version at Geneva earlier this year.
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Do you mean to say that the Z4 coupe racer has the N54? I thought it was powered by a modded S54....