Would i need if i was going to get hold of some audi s3 wheels??

205/40 17 like these...

Or 215/40 17 will also work.

yeh there the babys

would 215 just give a wider look from behind?? or is not much noticeable??

It will give the rim slightly more protection, but for what its worth IMHO the 205's look better.

I would disagree there... 205's look slightly stretched over the rim... 215's look better

but either 205/40/17 or 215/40/17 would suffice

Yes they do look slightly stretched, thats why i think they look better

Ahh lol i dont like a stretch