Hi! On my phone, so to cut a long story short, I have an A3 Quattro 2006 8P2 TDI 2L When I accelerate harshly, I get a loud humm (constant). When I reach 75mph & in 6th gear, I get a humming vibration, it resonates on and off continuously. Go above 80Mph and it goes away... I read I could disable Haldex by putting the hand brake on 1 click, I did this and went for a drive: No vibrations when accelerating. Only an extremely mild version of the above at 75mph in 6th. Hardly noticeable. I then took the handbrake off and BOOM! Vibrations. Haldex is shot? Oil change? Filter change? Pre charge pump? Per credit card max out pump? sell the car change? No errors on VCDS at all. Googled the hell out of this one to get this far! Hope someone can help with the above info. Thank you!