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.

Recently moved to Winder some looking for a new automotive maintenance place to keep up my cars so…read morelooked for references in Hensley was highly recommended so came here. I drive a Mercedes which is hard to service but both Mercedes dealers have proven not to be honest" me $10-$20,000 for anything I take in there so I find local service locations with a certified Mercedes tech and these guys did a great job at 1/3 the price I was quoted at fire stone in flowery branch. A place I just spent $3000 I knew air conditioning and brakes then would not get back to me to give me a tuneup and change the oil... Firestone told me my son could do it for cheaper! Ainsley found another problem I will have to fix that the other two previous service companies missed which I don't know how having so much work done the last year but they gave me a tuneup changed the oil and filter in a few hours and did a great job!! Clean place, professional, I felt like they were honest and upfront and I got a good value so I highly recommend!! I love spending $800 less to get more!!

The orices are ridiculous Quoted 290 for a transmission oil…read morechange. The dealer charges 220.

Amazing experience here. My car broke down on a trip through Georgia. I called around but most…read moreplaces didn't have any technicians available. This place saw me immediately. They showed me the broken part on my car and explained the damage, before asking what I wanted to do. I was in a hurry so they went to the auto part store; instead of waiting for the auto part store to deliver to them. The repair wasn't as bad as they initially suspected so I got out in a few hours. Cool family business. Would go out of my way to get repairs done here again.

Every. Single.Time. i have gone here without fail they have always found something else wrong with…read moremy car always turning my oil changes into something 10x as expensive which is incredibly upsetting considering money is very tight for me

Outstanding service and price. He was $300 cheaper than the dealership and the bumper literally is…read morebrand new now.

I was SO happy to find Zintar! He was the perfect fit to help me complete my boat project. His…read moreattention to detail and his willingness to guide me so I got what I wanted was amazing. Excellent service. Excellent work. Excellent communication. Excellent value. We will be bringing all of our auto or marine painting needs to Zintar.

I've had my oil changed here a couple times and more recently had an alignment and purchased new…read moretires for my vehicle. The staff is friendly and I'm always happy with what was done to my vehicle. I do suggest making an appointment because this shop stays busy.

These people will lie right to your face about parts needed. When I confronted the store manager he…read moresaid my vehicle was not reparable due to accident. All lies!

No need to look anywhere else! The team at Joey Watkins is the absolute best! The moment you walk…read morein, you feel welcomed. They didn't try to push any services on me that I didn't request. Walked in for an oil change. Price was super fair & they got me in and out of there relatively quickly. Will definitely be getting my vehicle serviced here from now on!

I brought my Ford F150 to Joey Watkins Tire & Automotive after the truck stalled and had to be…read moretowed on 05/31/26 from the Target parking lot in Flowery Branch. Prior to stalling, the truck had been jerking, sputtering during acceleration, and losing power while driving. After evaluating the truck, I was told the spark plugs needed to be replaced. I approved the repair and paid $509.19. I was then told the truck was fixed. Unfortunately, shortly after leaving, the exact same issue happened again. The truck began sputtering and completely died near Friendship Road and I985, creating a dangerous situation in traffic and resulting in another emergency tow that cost me an additional $300. I returned the truck and explained that the issue was still occurring. However, because the truck happened to start for them during testing, I was told they could not replicate the problem and did not know what was wrong. I specifically asked about fuel system concerns because the symptoms felt fuel related, but no diagnosis was made beyond the spark plugs. At that point, I no longer trusted the truck to be safe to drive and took it directly across the street to Christian Brothers Automotive Buford for a second opinion. Shortly after arriving there, the truck stalled again while they were attempting to move it into the service bay. Because the failure occurred while connected to diagnostics, they were able to pull active fault codes indicating issues with the fuel pump and fuel pump control module. I ultimately authorized approximately $2,000 in repairs for the actual problem. In retrospect, the spark plug replacement appears to have been more of a guess at the problem than an actual diagnosis, especially considering the symptoms remained exactly the same immediately afterward and the real issue turned out to be fuel system related. To be fair, intermittent mechanical issues can be difficult to diagnose, and the staff was polite throughout the process. However, I am disappointed that I spent over $500 on repairs that did not address the issue at all, followed by another breakdown and tow immediately after being told the vehicle was fixed. Given the safety risk involved with a vehicle stalling in traffic, I expected a more thorough diagnostic process before being told the truck was repaired.