First of all a friendly hello to all elk dompeteurs, after DB, BMW and Audi I have now a nice black D5 from 2003 with Autom., leather and all the stuff. I am totally satisfied. Only the chassis was too soft for me. I bought him 2 x 15 mm widenings from Heico and for a few days also the 30 mm sports suspension from Sachs. Actually I did not want to go deeper but there was only the chassis to make it harder and more precise. At the moment I have winter tyres on it with 215/16 but would like to raise in the summer 225/16. But also 17s or 18s but my workshop thinks that it will become too hard after all. Does anyone have experience with this combination? With 163 hp and the automatic it goes quite neatly, but is not a rocket. Does anyone have experience with chip at D5? Does that bring anything? And if so, which chip? Heico or MR, or anything else? Is there really such a weak point in the car that you have to pay attention to, as the tooth strap at the older 5 BMWs already?