Honestly the reason the 6 population isn't represented here, is there are two major 6 ONLY forums that are on the web, with over 30,000 combined members...so this site is more of a secondary handout, stopby point, and doesn't really compete to dedicated only sites.
There are stage 1 through stage 5 clutches available, as well as lightened, findanza, and mazdaspeed flywheels.
Stock flywheel weight for the v6 6s is 25 lbs, lightened is 15, findanza is 8, unknown on the mazdaspeed, but I'm guessing 18-20.