had the passenger side wheel bearing replaced and an oil change at schaumburg audi, who refused to cover the work under warranty due to my "modified suspension". i'm never going back to schaumburg audi again. on the plus side, the s4 xenon housings that i bought as part of the group buy from avalon motorsports came today, so i attempted to install my new xenon kit from spp in the new housings. that didn't work as the s4 housings expect oem ballasts, which are much smaller than the philips ballasts from the spp kit. so, i gave up after many hours of frustration and just installed the xenons in my stock housings.