Good luck, it will look good on 17"s. I have a 1.5 dci on 16" and lowered 35mm and I have gone to 55 profile tyres to increase the fuel efficiency a bit further. There is no rubbing whatsoever. So 17" on 40 or max 45 profile rubber should be fine. Dont forget to post pics. If they are Eibach springs, increase the rubber on the end of the springs to prevent clunking....