http://www.discounttireshopper.com carries them as well.
tho not grassroots at all i want this one 57k and oh around 1000 hp.... http://dallas.craigslist.org/dal/ctd/2355089321.html
If the autocross is run by an S2000 club usually (if they are smart) the course will be setup for an S2000. My local autocross is run by Miata guys and the bigger cars get the short end of the stick.
For some reason the Corvette Club autocross near me hasn't figured this out, the cones are barely wide enough to fit their 8ft wide cars through, consequently they get very mad when the 1995 M3 LTW shows up and creams them on their own course (with a much better driver as well).
Moral of the story: design courses that fit your car.
I've seen only one Viper run an auto cross. I think the driver was afraid of it,the way he was driving.
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