Audi S4 B8 vs BMW M5 F10

Unsure of BMW correct specs, but for sure the car is not stock - in the entry form the owner declared it as having 700+ chp.

Mine is a 2010 B8 S4 with 186/57 pulleys, CAI, Supersprint headers and an AMS intercooler. Forged wheels with Hankook R-S3 tyres, which have seen quite a few heat cycles. Boost is 1.3 bar (19 psi).

Car ran all day ~11.9 on an unprepped track in 27 C weather, rising above 12 only once due to bouncing off limiter on 2-3 upshift.