Okay I guess I have to say something

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First of all I must say to Murtaza, great job!!! You took care of business. You represented the M5/M6 brand proudly.
Now to the next point. After being inferred that I'm an idiot by member bluestreak, I have a little input.
I own these cars. I have the M5, 997GT3 and 997GT3RS so I personally know them well.
There was a thread on 6speed showing a video where an orange 997GT3RS on a rolling start out pulls an M6. This became a lengthy thread with much contention and anger about the results.
I fought hard stating that, NO WAY IN HELL that was truly possible.
I got jumped on and eviscerated. Nobody would accept my position. They would not accept any videos I submitted.
They would not accept my position nor I theirs.
I had planned a run between my GT3 and my M5. Abid and I were going to do it when all the M5 TT built motor came up.
I will say that this topic using my GT3 is a very different matter. Considering the mods, my GT3 dyno'ed 392 rwhp which translates to 460 bhp. The car weighs a tick below 3000 lbs. Those numbers would appear to possibly favor the GT3.
I still believe I should plan a run with another local M5/M6 against my GT3. I should clarify that the intended run was to be my M5 on motor. Nitrous would be unfair.
Currently trying to sell the serial killer GT3 so we'll see what happens.
Conclusion: Stock for stock the M5/M6 will beat the 997GT3 or 997GT3RS. Though my GT3 is the exception

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Cheers
Ranger