The C63 has has similar bolt on mods with a Eurocharged tune, catless pipes, and aftermarket filters with the charcoal element removed.
Regardless, you see two of the best German naturally aspirated performance engines ever built going at it here. The M156 from AMG is obviously larger but the S85 V10 revs higher. Its top end takes this race and it goes to show how important revs, horsepower, and gearing are on the highway.
Both tuners of these cars are vendors on this network so there is no stake in this race. It is simply great to see.
Further details in the words of the M5 owner:
Hey guys, some more fun racing videos.. This time hunting down a C63 again.
Evolve Alpha N tune
OEM RPI de-catted headers
RPI GTS Exhaust
RPI air scoops + BMC filters
RPI oil cooler
Fully Catless, modded with filters + charcoal delete
Video quality is off a crap crap!!! cell phone from a friend as no go pro around..Apologizes..
But non the less shows the modded M5 pulling nicely.
In C63 race 1
In M5 view race 2: C63 gets jump, M5 goes fishing
Just want to take a moment aswell and give a Big thanks to Evolve.. Their tune is running amazing!! The power and the consistent delivery is just amazing! I am extremly happy how my car is running and performing. They make the best tunes for this V10 motor by far!
I also wanted to give a small write up here showing how my car performed with the evolve tune vs the ESS tune against the same exact C63:
Compare my M5 pulling against the C63 here with the evolve tune vs how my M5 pulled here with the ESS tune against the same exact C63 with same mods. With my evolve tune in the above video, I am pulling away much faster and harder than I am here.