Isn't already the V5 TDI in touareg?! it has one diesel with 313hp! I think that is the one you're talking TT.
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"Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall, torque is how far you take the wall with you."
Here they have a 5.0 V10 TDI, 313hp, i was checking the magazine here. That's the correct one. They have either the 3.2 V6 Tiptronic with 220hp and 2.5 TDI with 174hp.
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"Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car. Horsepower is how fast you hit the wall, torque is how far you take the wall with you."