[BMW135pls]

I don't know the answer to your question, but 6th gear isn't really a gear for putting power down. Maybe it is a necessity in your case since you would like to see the top speed of the vehicle, but not normally. 6th gear is an overdrive gear, much like every other car geared for road use, and that means its gear ratio is less than 1, so the power/torque output to the driveshaft is greatly reduced, as power delivery is not what it is meant for. I'm not even sure what could happen if someone were to put full throttle tuned power down in 6th gear. I am not sure, but in my head I think it would cause the engine and transmission heightened levels of stress since all that power is bottlenecked at the transmission and you wouldn't get much speed out of it.