Thread: BMW is quoting M4 at 3.9 (vs 4.2 for M5), is there a chance it's faster?
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      06-17-2014, 12:22 PM   #78
SocalBM
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Drives: Porsche GT3
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Don't suppose you guys have seen this yet?

http://f80.bimmerpost.com/forums/sho...d.php?t=998857

In a nut-shell: 420rwhp stock, up to 480rwhp on a 2 day, hack-job tune, nothing optimized.
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