Speed is restricted in 6th gear and the speedometers are notoriously miss calibrated. After break in and changinging my rear tire to a q3 i did several back to back top speed runs and saw an indicated speed of 164 mph. I was happy, I thought maybe the profile of the new rear tire gave me a few extra mph because its restricted by rpm in 6th. Turns out after repeating some top gear high speed runs my speedometer was off by11mph. Mine hits the chip in 6th @153 every time. I've reached the same speed in 5th. I'm going the route of reflashing the ecu to raise the rev limiter by 500 rpm, remove the top speed restriction, disable the pair valve, disable the exhaust valve, eliminate the timing retard, eliminate the fuel cut, make the secondary throttle blades open mare aggressively and stay open. I know a lot of people swear by the Tre and other devices but in my opinion I can get more out of a proper reflash.