I have only driven my E34 //M5 and the comparision is NONE! 2 Totally different cars, the BiTurbo has a warp speed acceleration from first gear up to 5th and begs for more. I got mines up to 145 and it was so smooth and sturdy it was unbelievable. I was on a open road but was scared to go past the 145 mark( i have never been that fast before)And torque WOW I put down 388ft/lbs at the wheels and 325 RWHP on my dyno run. I will dyno my //M5 today.