S3 Spoilers

As far as i know its only the wheel arches what stick out further, pretty sure they share the same boot.
 
it will fit. I have one on mine (as do plenty of A3 drivers on here). the S3 has 4 bolts that allow for it to be attached to the boot. to fit onto an a3, remove these and stick it down. had mine on for around 3 years and no problems.

hope that helps

Rob
 

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