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GMS – or Granatelli Motor Sports – is a company with a 70+ year history of making engine components to boost the swiftness and power of performance vehicles, including Silverado pickups today. Sited in California, they know the ins and outs of CARB compliance, so most of their parts (even their superchargers) are 50-state legal in the USA. GMS makes a top quality line of 1999-2013 ignition parts, which you can find right here on American Trucks. Their high performance ignition wires – sold in red, blue, or black – have a resistance per foot close to 0 ohms, enabling all the coil power to streak through to the spark plug. That can generate as much as 15 rear wheel horsepower for your pickup, and similar amounts of torque. GMS also manufactures intake parts, such as 2009-2013 mass air meters, 1997-2017 exhaust accessories, and more, all built to the same superb quality standards.

Fitment Includes

  • LT Z71, LTZ, Z71, LTZ Z71, WT, Work Truck, XFE, Hybrid, Lingenfelter Reaper, Custom, Special Ops Edition, High Country, LS, LT Silverados
  • Engines: 4.3L Vortec V6, 4.8L Vortec V8, 5.3L Vortec V8, 5.3L Flex-Fuel Vortec V8, 6.0L VVT Vortec V8, 6.2L VVT Vortec V8, 4.3L EcoTec3 V6, 5.3L EcoTec3 V8, 6.2L EcoTec3 V8 Silverados

*Please see Silverado parts pages for any exceptions.

GMS Silverado 1500 Parts