Originally Posted by BMW-M-Mexico
No idea in hell!!! Have never really accurately measured this. But I suppose the ultimate test is that on the long part of a race track where I take the car I used to do almost 240kph and I am pulling a tad over 260 now. This is also very consistant with what I was told. I also do "feel" a power increase. In order to measure 0 to 60 I need to buy a proper device.
You may find that there is little improve to 60mph as traction will be more of an issue but it's time between 50~150mph will be greatly improved.