Ah, You will probably find with wheels on the noise comes back while on the car stand. It's to do with the CVD not being true CVD's so when you move them to a significant angle the wheel, while rotating tends to rock slightly faster then slower during it's rotation. When the whells on it's own momentum cause the CVD to hit both ends of the backlash causeing the thrup-ing noise.
It's somewhat normal, although not healthy to put the car on the stand and do it just for fun!
You should find that there's almost no noise on the track until you're using full steering lock.
Most TC's at least have this to some degree- it's why Xray brought out their ECS driveshafts, but most people agree that in terms of laptime, on the Schu at least, it's not an real issue.
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