quick wheel question... need an answer quickly. plsssss.

Yeh in most cases it will be fine.

A lot depends on the tyre, some brands are chunkier and might catch on the uprights, but ET42 gives a bit more room anyway so i'd suggest you'll be fine.
 
If Im not mistaken, A4's go for +35 on aftermarket wheels and a flush result, so I believe +42 is safe enough even with bigger tyres.
 

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