What is the biggest set of wheels i can get on an 03 A4 without having to make any mods?

i've seen 20's, but in my opinion it looked stupid.
19's are the biggest that still look good.....again my opinion

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"Objects in mirror appear to be losing" - audi owner

2004 A4 Ultra Sport 1.8T
6 Speed
APR Stage 2
R1 DV
APR Snub Mount

19s fo sho. Thats what I have, with 235/35/R19 rubber

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+1 I have 18's and think you could probably only go another inch without the wheels looking too big for the car

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2002 Audi A4 Quattro 1.8 Turbo
NeuSpeed ECU, Exhaust, Short-Shifter, SwayBar, Boost Gauge, Votex Body Kit, Clear-Corner Mod, Lowering springs with Koni Shocks, Euro side-mount Intercooler.