I have a 2014 550xi with the TU motor and it's a beast of an engine. I had Catless downpipes, Meistershaft exhuast, custom filters and a custom tune.
Car had roughly 550whp and 600wtr to the wheels.
My 1/4 times (I hold world record for the 550,650,750) was 11.5 at 120mph. My 0-60 on vbox was 3.4 all day! The car was an animal. 0-100 very powerful and drivable in comfort. Also it's all usable power.
M6- just picked it up a few days ago and yea.. Completely different animal. It's just saw raw and untamed. It will kill you! Lol overall two different cars. If you prefer with raw power with No fucks to give them M6 is the car. If you like a tad more luxury over power then 650 is the car. But only the one with TU motor.
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