The M3 with VT1-550 should be faster then any stock F10 M5!
The reason I'm saying this is because I already raced a DCT M5 on the highway with my manual M3 on stock cats with VT1-535(basicly the slowest configuration of an M3 VT1 you can get) and from ~50km/h to ~220km/h it was dead equal!
I'm sure that now with my test-pipes I should be just ahead and when I'll do the upgrade to the 550 pulley and tune, even more ahead! Logically a DCT M3 with VT1 should destroy the M5!(keep in mind that I always run 94octane in my car which I have found to make a HUGE difference on my butt dyno compared to 91octane)
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