I've hit 227km/h on my car, what is that in miles, just shy of 140? If you take a 5.0L from this era yes it will get you there faster, maybe a little higher top speed but you definetly won't have the confidence with our cars especially with the mileage we are all accumulating. Right or wrong speedo it was still fun and fast and the car was amazingly smooth and solid at that speed. Props to the engineers at BMW + Dinan chip, removed silencer, k&n as those are the only things done to my 245,000km car.