Heres the thing. The GS-T is putting all that power to only two wheels , whereas the GSX/TSI AWD, your dividing it into all 4 wheels, so less stress , clamping force on the rest of the parts. The CW theory, is that this causes stress to the rest of the car ie the engine causing the crank to 'walk' prematurely. This is why you can run a 2600 on a awd much easier than a fwd. Most people who have GST's have used the 2100.