ya i think 20s might be too big, plus you will have a really uncomfortable ride... i wouldnt go with anything bigger than 19s if that, especially if you have a lowered ride or plan on lowering it as it might rub
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2005.5 A4 2.0Tq 6speed
-Snub Mount
-Carbonio CAI
-Smoked side markers
-Smoked front bumper reflectors