Unlock more power and a killer sound from your GM truck! These are performance headers designed for 2000-2006 Chevy Avalanche, Silverado, Tahoe, and GMC Sierra models with the 4.8L or 5.3L V8 engines. They're made from high-quality T304 stainless steel with a chrome-polished finish for looks and durability. The design features 1.75-inch primary tubes that merge into a 2.5-inch collector, improving exhaust flow over the restrictive factory manifolds. Expect gains in horsepower and torque, plus a more aggressive exhaust note. They're a direct bolt-on replacement from AutoRuning, backed by a 90-day warranty. A great first mod for your LS-powered truck. Feel the difference!