Very impressive indeed and shows that with some mods the M5 can be quicker than an RS6 estate, but when both are stock the RS6 is the quicker.
Also, not wanting to turn this into an Audi vs BMW debate but how do we know that this was all that was done to the M5. Can you tell us the respective drivers of each car and what forums are they from if any?
P.S.
Even you T Bone have to admit that pound for pound, dollar for dollar, if you spent the same amount of money in the RS6 you would have given a hp lift of a bare minimum of 60hp and that would have meant 640hp which would have easily beaten this M5.
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