Not sure on tuners, but ATS in Columbia has a dyno. As far as audio, Nortons has good prices( just dont let them install), Ultimate Audio in Lexington is kick arse, and Power Audio here in Sumter will definately treat you right ( ask for Bill and tell them Jim Lyles sent ya!!!) Where in SC are you?
dude, i'm also in sumter. i probably seen you around, and you've probably seen mine. what does your car look like? you can see what mine use to look like at cardomain. http://members.cardomain.com/fievel28