Is it possible to equip a base rx-8 with DSC?

You could use an aftermarket supplier such as:

http://www.racelogic.co.uk/

just an example. No idea what it would cost, or how easy the install would be, however.

no one will install that unit my friend has for his supra. 2 years no one has taken the job yet. 800 is it worth it? practice driving in adverse conditions, parking lot? skidpad. spend your money becoming a better driver, dont trust your life to a onboard computer. imo