Yet it can never send more than half of available torque to the rear, like a traditional Haldex setup. For normal Audis, that’s perfectly fine. However, Audi never used the Ultra system in ...

Vehicles with Haldex all-wheel-drive systems (manufactured by Haldex but installed in various vehicles under different names) use specific fluid and filters designed for those AWD systems.

I loved that TT, and always fantasized about lifting it with mud flaps and installing a Haldex controller to lock torque split at 50:50 front to rear. But of course, a 2001 Audi with 140,000 miles ...