Quantum Performance has been amazing to work with! They tuned my 370Z perfectly and keep my silvia…read moredrift car running strong. Always professional, knowledgeable, and reliable. I wouldn't trust anyone else with my cars.

From the owner: Quantum Performance builds high-powered street cars, show quality customs, and track ready…read morevehicles, all backed by decades of combined experience. Our team includes expert mechanics and a tuner with deep roots in motorsports, specializing in engine builds, ECU programming, custom fitment, and full performance upgrades across imports, domestics, and exotics. With an in house Dynojet, we fine tune every build for precision and power. Located near Road Atlanta, we’re proud to serve the performance community with VP Racing Fuel, nitrous refills, and the real world expertise that sets our winning builds apart.

Hands down the best motorcycle painter. Daar has an incredible eye for detail and the finish is…read moreflawless. Professional, talented, and a true enthusiast. My bike has never looked better!" If you're picky about your bike, this is the place to go. Daar just finished a custom job for me, and the attention to detail is unreal. The lines are sharp, the clear coat is like glass, and there isn't a single imperfection. It's rare to find someone who treats your bike like their own, but he absolutely does. 10/10 would recommend."

I was interested in a unique one of a kind custom paint job for my 2025 Indian Sport Scout…read more Research it a bit and found J Daar Customs. Daar was awesome! He understood what I was trying to do, made some great suggestions and really exceeded my expectations. Not only is the design memorable but the quality is first-rate. Definitely worth the money for a truly custom paint job.