S-Tech lowering kits?
 

have you guys ever heard of S-Tech lowering kits?
http://sfbay.craigslist.org/sby/pts/309543515.html
i found it on craiglist $400 installed.
basically i got my a3 premium, and i'd like it a little lower and with not as much gap in the wheel wells.
is it better to lower and get new rims (18's) at the sames time, so that the installer can make sure they fit ok.

thanks