Looking for in-stock aftermarket parts to modify or upgrade your 2003 GMC Sierra 3500 with headers & manifolds? At Tunersports.com we carry a huge selection of the top name brand performance headers & manifold parts and accessories for your Sierra 3500.
Whether you have a 2003 GMC Sierra 3500 in Base to SLT trim we have you covered. We have 17 headers & manifolds available to mod your Sierra 3500. All parts have free shipping to the Continental US 48 States.
 IN STOCK 46-40024Advanced Flow Engineering, Inc. (aFe) produces high flow, high performance air filters & intake systems for the automotive industry. Founded in April, 1999, aFe was created to address an obvious need in the automotive aftermarket industry: a lack of choice for a high performance aftermarket air filt... aFe Power BladeRunner Ported Ductile Iron Exhaust Manifold 01-16 GM Diesel Trucks V8-6.6L (td) 2001-2006 GMC Sierra 3500 SLE / SLT 2002-2005 GMC Sierra 3500 Base $630.18 SALE |
 IN STOCK - DROPSHIPS 48-44001The new Twisted Steel performance header from aFe Power is redefining the header industry with new pulse control technology. aFe engineers have designed this header using optimum tube lengths and mitered collectors for maximum flow and velocity for power delivery across the entire power band. Combin... aFe Power Twisted Steel Headers 409 Stainless Steel 02-13 GM Silverado/Sierra 1500 V8 GMT800/GMT900 2003-2005 GMC Sierra 3500 Base 2003-2006 GMC Sierra 3500 SLE / SLT $895.97 SALE |
 IN STOCK 4006These BBK Performance shorty tuned Length exhaust Headers are designed and constructed as direct fit replacements for all 99-09 GM Truck and SUV 6.0L applications. Each header is manufactured with 1-5/8 CNC mandrel bent tubing that offers unrestricted exhaust flow for increased horsepower and torque... BBK 99-04 GM Truck SUV 6.0 Shorty Tuned Length Exhaust Headers - 1-3/4 Titanium Ceramic 2001-2006 GMC Sierra 3500 SLE / SLT 2002-2005 GMC Sierra 3500 Base $499.99 |
 IN STOCK - DROPSHIPS 40060These BBK Performance shorty tuned Length exhaust Headers are designed and constructed as direct fit replacements for all 99-09 GM Truck and SUV 6.0L applications. Each header is manufactured with 1-5/8 CNC mandrel bent tubing that offers unrestricted exhaust flow for increased horsepower and torque... BBK 99-04 GM Truck SUV 6.0 Shorty Tuned Length Exhaust Headers - 1-3/4 Silver Ceramic 2001-2006 GMC Sierra 3500 SLE / SLT 2002-2005 GMC Sierra 3500 Base $549.99 |
 IN STOCK 1041460Replaces factory driver's side "pinched down" unit; Restores exhaust flow and balances the V8 engine for smoother running; Improves exhaust velocity to drive the turbocharger; Improves power; Direct, bolt-in replacement; Tapped to accept the most popular EGT probes; High-silicon ductile iron; Lower ... BD Diesel Manifold Exhaust - 2001-2010 Duramax 2001-2006 GMC Sierra 3500 SLE / SLT 2002-2005 GMC Sierra 3500 Base $191.72 |
 IN STOCK GP131S-CEvery Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock ... Gibson 01-03 Chevrolet Silverado 3500 Base 8.1L 1-3/4in 16 Gauge Performance Header - Ceramic Coated 2001-2003 GMC Sierra 3500 SLE / SLT 2002-2003 GMC Sierra 3500 Base $762.38 |
 IN STOCK GP500S-CEvery Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock ... Gibson 02-06 Cadillac Escalade Base 6.0L 1-5/8in 16 Gauge Performance Header - Ceramic Coated 2002-2005 GMC Sierra 3500 Base 2002-2006 GMC Sierra 3500 SLE / SLT $762.38 |
 IN STOCK GP131SEvery Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock ... Gibson 01-03 Chevrolet Silverado 3500 Base 8.1L 1-3/4in 16 Gauge Performance Header - Stainless 2001-2003 GMC Sierra 3500 SLE / SLT 2002-2003 GMC Sierra 3500 Base $641.03 |
 IN STOCK - LOW GP500SEvery Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock ... Gibson 02-06 Cadillac Escalade Base 6.0L 1-5/8in 16 Gauge Performance Header - Stainless 2002-2005 GMC Sierra 3500 Base 2002-2006 GMC Sierra 3500 SLE / SLT $641.03 |
 IN STOCK - LOW 1850S-3JBA 03-06 GM Truck 6.0L LS w/o EGR 1-5/8in Primary Raw 409SS Cat4Ward Header 2003-2005 GMC Sierra 3500 Base 2003-2006 GMC Sierra 3500 SLE / SLT $641.45 |
 IN STOCK - LOW 1850S-3JSJBA 03-06 GM Truck 6.0L LS w/o EGR 1-5/8in Primary Silver Ctd Cat4Ward Header 2003-2005 GMC Sierra 3500 Base 2003-2006 GMC Sierra 3500 SLE / SLT $799.95 |
 IN STOCK - LOW 1860SJBA 01-03 Gm Truck 8.1L BBC w/o EGR/A.I.R. 1-3/4in Primary Raw 409SS Cat4Ward Header 2001-2003 GMC Sierra 3500 SLE / SLT 2002-2003 GMC Sierra 3500 Base $599.95 |
 IN STOCK - LOW 1860SJSJBA 01-03 Gm Truck 8.1L BBC w/o EGR/A.I.R. 1-3/4in Primary Silver Ctd Cat4Ward Header 2001-2003 GMC Sierra 3500 SLE / SLT 2002-2003 GMC Sierra 3500 Base $759.45 |