I am due to put a set of 19" BBS CK's on my 2006 S3 this weekend on a set of 225/35/19 tyres. offset is ET44 on these. i know that these dont sit great on standard suspension so I am also looking to put a set of AP Coilovers on so the wheels sit nicely in the arches. What I want to know is how much to lower the car by to avoid having issues with speed humps, particularly the big buggers which go all the way across the width of the road? I dont want my car to catch anything if that makes sense? HELP PLEASE??