I do not know of anyone near that specializes in 3/s but you can go into the mechanics with a knowledge of what needs to be done. Check out these links to learn about and even purchase the parts for your car. In total you should spend around $350 for parts give or take.
http://www.team3s.com/60k.htm
http://www.vr4stealth.com/60k-tune.htm
http://www.team3s.com/~egross/3S/Mai...elt/index.html
http://www.automotiveforums.com/vbul...d.php?t=376006
www.thepartsbin.com
www.3sxperformance.com