How about a twin turbo S54 variant...
A 3.3L turbo could easily put down 450bhp (136bph/L) with some good tuning and a high redline on a good breathing engine.
I would be surprised if the new M3 had 8 turbocharged cylinders. Probably even more surprised by a V6 given BMWs history and gospel of straight 6 perfection.
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2009 Spacegrau 335i
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