There was a 16" wheel for the 4.2 (non sport), but I have not seen many other Audi wheels in 16" on the 4.2

I've got Mods, really you can Mod a A6


LLtek air scoops,
LLTek HID high Beams.
RS6 grill,
Stasis two piece HP rotors,
Hawk HP Plus pads,
GIAC
Tip chip
,K&N filter
H&R Coilovers
H&R Adj.SwayBar'
00032,
Sirius radio
Magellan 4040 Navigation
18" OEM RS6,
255/35 18" Dunlop SP9000S,
stand alone Fog lights,
20% 3M tint
Vag-Com windows/remote
debadged deck

and now Exhaust......
Modified RS4 mufflers and resonator