I can'f afford replacing the 16" stock wheels with GREAT new tires at the moment.
But motive power (300 HP) calls for larger front brakes (and I need new calipers and rotors anyway).
I have seen B7 kits offered with 321mm rotors and calipers, that supposedly may fit 16" (potentially spacers).

Can someone point in the right direction?
Are such kits available AND fit stock 16" wheel (maybe with spacers)?

 

Try this for front maybe: Audi B6 A4 Quattro 1.8T Braking Big Brake OEM ES#1406 Front Cross Drilled & Slotted Big Brake Kit - B6A8BBKNPASXR

Looks like a great price on a reputable site, but I don't have the upgrade, so I can't offer any first-hand experience.