Have you guys seen this video?
BMW M5 E60 (Mr boomerang) VS M5 F10 pp-performance FROM 40 KM-E60 WIN - YouTube
Is Mr Boomerang on this forum? Looks like his RPi E60 M5 WITHOUT a Tune beat the F10 M5 PP twice? And his other videos show him beating quite a lot of other fast cars.
If you're on this forum, can you tell us exactly what you have done on your car? From the info, it looks like the mods are:
RPI GT Exhaust System
RPI St Pully Kit
RPI Block off plates
RPi SV1 Oil Cooler
If that is true, that is quite impressive.
Or maybe the F10 M5 PP is having similar symptoms of Power loss like some F10 M5's have reported. Sort of like what's going on with this one:
Evolve BMW F10 M5 dyno testing stock car for consistency - YouTube
Forced induction can be quite inconsistent and problematic sometimes. Especially after a few runs. BTW, the V10 sounds mean.
Dark videos at night. There are videos are there is reality. I am assuming of course the drivers in other cars are competent drivers and starting race in optimal gear and speed.
Take a look at what i think the result should be with competent drivers of heavy modded e60 (no SC) and f10 stock daytime where you can actually see the 2 cars race. Keep in mind your temps shot up through the roof in E60 after several runs (my car did) and you lose some hp with very hot car so no car is safe from heat problem after back to back to back runs. FI cars perhaps affected little more because of design but a E60 without SC will not touch a properly driven F10 (stock)