What is a safe amount to lower a standard A3 (i.e. no sports suspension) on 18" wheels? Just recieved my RS4s and will be fitting them myself on thursday, then taking it down to my local garage to have it lowered. Before I do, I'll need to know what a safe amount to lower it would be before I buy my springs/shocks. I don't want it to be the absolute maximum 'safe' lowered amount, just something that will make the arch-tyre distance look suitable and not 'tractor like'. Thanks. PS. On a side note, what do A3/S3 owners think of SPAX suspension? They seem well priced. PPS. Whats the ride quality like on a 30mm lowered car? Is it much different to standard?