I don't have answers on application, a performance shop did the install. here's the low down, koni sport(yellow), H&R sport spring and Hotchkis frt/rear sport sways. I did research first and most said the ride was firmer but exceptable for a dd. when I got the car back I noticed not one corner had the same drop, actually the rear doesn't look lower at all. it rides like it has steel wheels, alot of chatter noise on anything but table top smooth roads. the handling is the only plus at this point to the susp. mod, the koni shocks were 1st set at their firmest setting then as they are now at medium. I was thinking of adjusting the shocks to their softest setting but others with this set up say on medium the car rides/handles very well. There maybe a problem with the application and or product, not sure. I probably will bring it to Audi this week to see what's up....any of you have this problem......thanks