In GA I'd only recomend 2 shops
A&W Performance - Jasper, GA (Andy or William)
Modular Powerhouse - Roswell, GA (Tim or Andy) Use to be T&J Performance
Don't get me wrong there's other great shops out there and that do tons of business. This doesn't mean they'll ever get my money again.
I like these guys cause they're laid back and they don't push sales. They're straight foward and if you have any problems with the work they will put you to the front of the line.
A&W Performance - is a small shop but the guys are really nice William is kinda slow with technical explinations but he's a badass technican. Andy hooks everyone up, extremely quick, and tells you everything straight up. Need something done fast no waits here. Good shop to goto cause the guys aren't in it to make a living at it.
ModularPowerhouse - Tim is cool, really laid back but when stuff needs to get done he knows what to do. Andy is the workhorse cool dude too... High quality work just takes awhile to get everything done cause they have so much stuff going on.
I'm hard to please and one thing I hate is when people hang around the shop and lean up on cars this happens a lot around mustang shops. At A&W there's not that many people that hang out there plus Andy wont let anyone in the shop area. At Modularpowerhouse Rhonda, Tim's wife keeps all the punks off the cars, even at the big dyno days...
I called MV Performance about a charger set-up I wanted last year and spoke with Tim he was pretty rude.