GMC Sierra 1500 - 1999-2007

Holley is the source for your Air & Fuel delivery upgrades! From Carburetors to the latest in EFI Fuel Injection Systems and Fuel Pumps. We have your products from air cleaners to fuel tanks and everything in between. Sniper EFI has been leading the conversion to EFI for decades!

Take a look at our ever expanding line of the highest quality hose, hose ends, adapters, hose coverings, kits, accessories, hardware, and tools. Whether you're looking for high quality fuel hose, AN Brake lines, or PTFE braided hose for your build, we've got you covered!

Going fast is always our goal, but having the support and power to stop your hod-rod is a must! At Holley.com we have you covered for Rotors, Pads, Master Cylinders, Big Brake Kits and all supporting accessories to improve how your car responds.

Keeping your vehicle cool is the key to maximum performance. We have everything you need to help dissipate that extra heat. High Performance Radiators, Water pumps, oil coolers, and more.

From Ford Flathead to GM Gen V LT, and including everything in between like small-block and big-block Ford and Chevy, Gen III/IV LS, Coyote, Hemi, and more, we have the parts to coax more power out of the engine under the hood of your hot rod.

Holley is home to some of the top-performance exhaust brands in the world. Brands like Flowmaster, Hooker BlackHeart, Hooker Classic, Flowtech, APR, Dinan, and Flowmonster combine to cover thousands of applications and a variety of budgets. Whether you are putting a full stainless steel exhaust on your late-model muscle car or if your rat rod needs a set of Lakester headers, Holley’s exhaust brands have you covered.

A wide selection of fasteners & hardware for most high-performance engines. Choose from basic replacement products, chrome & stainless dress-up fasteners, and premium quality hardware.

Holley has the widest selection of high-quality gaskets you can find. From the intake manifold to the oil pan, and everything between, we have the gaskets to help you get your projects back together and back on the road.

Gauges, Timing Lights, Digital displays, Wiring harnesses, Adapters, Fittings, and more. When it comes to monitoring and tracking your engine and/or vehicle's performance, look to the Holley Performance family of brands and products for a variety of gauges and gauge accessories to choose from. Brands you know and trust like Mr. Gasket, Holley EFI, ACCEL, MSD, Earls, Sniper, and more.

Ignition, Coils, Spark Plug Wires, Distributors, and more from MSD, Holley, Accel, and Mallory! Incredible new exciting products from MSD like the Ultra 6AL, tune-up kits and so much more.

Holley is your headquarters for LS Power. If your next project is LS-powered, we have everything you need from intake to oil pan to get your engine between the frame rails of your LS Swap project.

NOS has powered more racers than any other brand of nitrous. When you're looking to go fast, rely on NOS to deliver the most power per dollar available. From stock engines to race vehicles, jet skis to trucks, NOS has a kit for you.

With 12 brands covering early and late model muscle cars, trucks, and imports, the Holley family of brands can get your project lifted, lowered, and or handling better.

We have the tools needed to support your projects - plumbing, carburetor, electrical, engine building, and much more.

From Bellhousings, Flexplates and Flywheels to Clutches and Torque Converters. Plus tons of the small pieces needed to button up or couple your transmission and drivetrain.

Power tuning and programming in the palm of your hand! Available for GM, FCA, Ford, and more! Multiple power levels and monitoring parameters for your gas or diesel powered ride! The powerful and wide-ranging calibrations found in our handheld and in-cabin tuners are capable of increasing performance, improving drivability, increasing towing power, and even improving efficiency.

Horsepower is always top of mind, but making your ride look amazing is just as important! At Holley we have a wide variety of Wheels and Wheel accessories for your build. We have exciting brands like Shelby, HK, Halibrand, Rev and so much more! We also have you covered with lug nuts, wheel spacers, tpms sensors and any needed accessory to complete your set up!