I've been there and dynod my GS400. It's a very nice shop... clean, the guys know what they're doing. Best dyno in the area I've found (been to both Tom's @ Belmont and the Mustang Dyno at P1).
The shop is located off Tryon near the Men's Club. Turn right at the Japanese restraunt, drive back for about 1/4 mile, then left. My GS is lowered and has a front lip on it, and I scraped bad pulling in so hit the driveway at an angle.
Some crazy domestic muscle there that's worth the trip to see. Here are some pics of the dyno - my GS, my GF's NSX, buddy's M Coupe.
Thanks. Didn't get a chance to give the NSX a wash before we went or it would have looked better .
After I get a new set of plugs in I'm going to likely dyno again. I'll post up - we can probably get a Lexus / Import dyno weekend set up again (they've done that once before). I know at least one other GS guy that would like to go.
Think it was $50 for three pulls last time with 02. They can also do a high speed run on their dyno which is pretty cool. If you take a look at my girlfriend's speedo in the pic you can see she's almost at redline in her NSX doing one (think it hit 189 MPH ).