215/35 on your fronts will give not only paper-thin side profile, but they'll shorten the rolling radius of the wheels, giving an inaccurate speedo reading, 4.55% away from 225/40, the legal allowance being upto 1.5% (in either direction), also resulting in incorrect mileage in the long term, as you car (and its fuel tank) will think its done about 104.55 miles for every 100 miles its actually done.