G-power is an amazing German tuner. Check out first their work on the BMW M5. If your M6 is boring and slow which btw, it shouldn't be, G-power has an amazing upgrade, they will boost your 507hp V10 M6 to a whooping 635hp. Yes, I said 635hp! That is just amazing, They say 0-60 is 4.6 which I find just bogus considering a stock M6 goes 0-60 in low-mid 4's and add 128hp, it should be a lot faster.

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