Touareg: 2008 V6 TDI
Join Date: Jul 2010
Location: Melbourne Australia
Second Vehicle: VW 2
Thanked 138 Times in 130 Posts
Wonder if a wheel bearing could be the culprit?
That's were I am thinking it may be from. Somewhere in the drive line as you state that it is speed related. At the very least I would get the oil in your differentials and transfer case checked for metal. The noise sounds like a vacuum leak, that you may find in the engine bay, however this would be very obvious at idle.
2008 V6 TDI, with the following Retrofitted Items:
ACC, Front & Side Assist, Paddle Shift, Towbar & Trailer Module, Fiscon Bluetooth. Reversing Camera, Front Fog Lamps, Redarc TowPro Brake Controller, T1 Door Warning Lamps, T1 Under Seat Drawer, Alloy Skid Plate, 5ton Winch, Cayenne Front and Rear Sway Bars, Tuned by Oettinger, Retrofitted 6 Piston Brembo Front Brake Callipers, Sports Steering Wheel, TPMS (OEM), Dual Batteries