Cool to see a M at the track, with that being said...
You pretty much went against cars "tuned" from the factory so to speak. Audi's S line along with the Dodges' SRT are those manfacturer's hi performance lines.
Would be interesting to see what the 5.6 would do against those cars or better yet Infiniti's twin turbo either 300hp or 400hp ....
(Would love to see an Infiniti version of the Nissan-GTR)