Pointless exercise. Vert M6 aka certified fat lady is more than 4500lbs and much heavier than M5. Stock M5 should be even or slightly faster so no new ground here.
Run M6 Couple and then we are talking. Title should be F10 M5 (tune) Vs F13 M6 (NOT F12 M6) stock - Gthaus
Add in decent sized passenger and driver in M6 and you are pushing 4800lbs-4900lbs
Something is seriously wrong in this world when M6 Vert with 2 passengers is close to 5000lbs.
Please make next video with M6 Coupe.