Authorized Performance Reseller

Southern Performance Systems was founded in 1994. Located in Sugar Hill, Georgia outside of Atlanta, Southern Performance Systems specializes in providing the most complete Turnkey LS engine packages for classic cars, muscle cars and trucks. In addition to engine packages to make a LS conversion complete we offer upgrades for brakes, suspensions, rear ends, air conditioning, electronic gauges, radiators and headers. Years of being an install center, doing design work and testing have made us a leader in the LS conversion market.

Above is a demo video of a RTX gauge cluster from Dakota Digital that we installed into a 57 Bel Air. The video was filmed with the lights dimmed to better view the gauge's light effects.

Are you looking for a new parts for your classic Muscle Car or Hot Rod? Give us a call at 678-482-0866.

Featured Hot Rod - John H's 1968 Camaro Convertible

This Blue and White convertible belongs to John Huke. John brought his 1968 Camaro to use for a LS Restomod. We took this 68 Camaro and swapped out the old dated 350 engine for an updated 495 horsepower LS376/480 engine. AC system was updated with a Vintage Air Sure-fit system while the electrical was updated with a modern fuse panel and wiring systems from American Autowire. We also be updating the Camaro's dash to a with a modernized Dakota Digital HDX gauge cluster.

Are you looking for a new engine for your classic Muscle Car or Hot Rod? Give us a call at 678-482-0866.

Engines & Transmissions

Engine options include LS1-LS2-LS3-LS7 in GM's Automotive Line and 5.3L-6.0L-L92-L9H for GM's Truck Line. The GM Performance Line offers the 480 & 525 Horse Power LS3s plus the LSx 376 and the LSx 454. Horse power options for the factory and performance LS engines range from 300 to 665. SPS offers custom builds using aluminum block and the more serious LSx block. For the budget-minded, there are some good used take-out engine available at great prices.

Transmission options include 4L60E- 4L70E-4L80E-4L85E and the new 6L80E & 6L90E 6-speed automatic transmissions. Manual transmissions such as the T56 Magnum and TKO600 are also available. SPS provides transmission that use a standard slip yoke, where as the production units use a fixed yoke that requires a 2- piece driveshaft. The 6-speed automatic can be used with a paddle shifter for those who want to shift the transmission without the use of a clutch. For high-horsepower engines, custom transmissions can be built to handle to extreme power and torque. Our stock torque converters work great with most engines and we have high-stall converters for our big cam engines. When setup correctly, these high-stall converters provide great gas mileage and work just fine on the highways. SPS will pair your engine and transmission with the converter that will work best for you.

Engine Control Modules & Harness Kits

All engine management harnesses are custom made to fit each engine/transmission package. Along with the harnesses that we offer, SPS also offers GM Factory ECMs (Engine Control Modules) and TCMs (Transmission Control Module) and custom programming. Each harness comes with Check Engine Light and Factory Diagnostic Plug which can be scanned by any shop with the right equipment. We also offer Holley ECM Controllers and harnesses for automatic or manual transmissions as well as FAST Electronics and Comp-U-Shift transmission controllers. Along with the LS engines harness, SPS now offers Harnesses and ECM Programming for the LT1 line.