Our shop

Founded in 2001 by James Sofronas, GMG has quickly established itself as North America’s premier performance tuning facility. What began as a small 1200 sq. ft. shop, maintaining two race cars, has grown into a 30,000 sq. ft. state of the art performance tuning, racing and service facility located in (Orange County) Santa Ana, California. The staff, attention to detail, and passion are what make GMG the choice of professionals and enthusiasts world wide. GMG is located directly across from Porsche Motorsport North America (PMNA). This close proximity offers GMG a clear advantage when upgrading performance and developing racing products for these outstanding automobiles.

The team at GMG has been racing, building, and servicing European cars for several years. Our professional level of service and commitment to our customers involves providing the highest standards in quality products that the automotive tuning industry has to offer. Whether you need a basic service for your European automobile or you’re getting ready for your first club race or time trial, we can help you enjoy and own that experience by utilizing all of our many years of experience.

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At GMG we have made an everlasting impression in this exclusive industry. Our knowledge and influence has carried us past the competition, making our opinion amongst professionals valued second to none. Throughout our years of experience, we have compiled the most comprehensive selection of parts. and accessories available for your automobile. Our helpful staff will assist you in making your car stand out like none other.

In order to maintain our commitment to providing you with cutting edge technology via proper diagnostic tools and computers, we work closely with several factory dealerships in the local Orange County area. This ensures a safe and reliable approach for enhancements to your car while maintaining the integrity of factory engineering. Give us a call, come by the shop, or visit us at the local race track. We will be happy to share our passion for automobiles with a fellow enthusiasts.