Interesting matchup here that is great to see as two different M engine philosophies battle it out. The M5 is the camera car but unfortunately a cell phone camera is used by the M5. Still, the video is clear so you can see exactly what happens. The modifications on the M5 are a Stage 2 tune that is not named, downpipes, and a custom straight piped exhaust. The E92 M3 is supercharged with the Active Autowerke Gen 2 Level III supercharger system.

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On paper this should be a good a race. Depending on how aggressive the M5 tune is along with the bolt ons it can show ~600 whp. Depending on the M3's boost it is also in this range. The M5 of course has much more torque which it also needs to move its roughly 800 extra pounds.

In practice it is a good race as the cars are dead even. They both appear to be DCT models so driver skill is not a large variable. A good run from two fast M cars going about their power boost in different ways.