1. Once he has them, he will probably keep them. But no positive price set here on out.

2. It will be, sort of. The back brakes do about 10% of the braking? so they might now do 15-20%?

3. Possibly, most likely, need to analyze those needs once a set is installed. And it might be different from person to person, so an adjustable valve might be best over what VW comes with.

Keep in mind this give you the opportunity to install disk brakes.