These are VERY good speakers. You should get them from an authorized site, like:
www.mobilesq.com My concern is how do you plan on mounting them in the car? The equation to "audiophile" sound is: 1/3 gear, 1/3 install, 1/3 tuning. Please see my tutorial on making fiberglass kickpanels. There's a good explaination of why door mounted drivers in the Audi is a bad idea.
Cheers,
Matt