Unleash the hidden horsepower, torque and throttle response that's simmering under your hood. JBA Headers are mandrel-bent for maximum flow and smog-legal in all 50 states. Firecone collector for greater output. Dyno proven 10-25hp gains. 1-year warranty.
Power up your ride with BBK Performance Exhaust Headers. Tuned for power and built for durability, BBK crafts both shorty headers and long tube headers. And, for explosive power you can count on, BBK performance headers are pressure-tested for leak-free service. 1-year warranty.
Dollar for dollar, few performance upgrades can match a set of Doug Thorley Headers. Tuned for power and smog compliance, Thorley exhaust headers come in Tri-Y, shorty and long tube header designs. Mild steel with a ceramic or nickel coating. Plus, Thorley exhaust headers carry a Lifetime Warranty.
Toss those rusty, restrictive, stock parts and increase performance and engine life with Gibson's custom headers. Enthusiasts and industry experts alike all agree that Gibson headers are the most cost-effective performance exhaust headers on the market. Lifetime Warranty.
Quality off-road long-tube headers at an affordable price—impossible? Not any more—go for PaceSetter’s Quik-Trip Long Tube Headers. These bad boys deliver roaring horsepower and torque, they seal tight, are made in the USA and carry a 3-year warranty.
Go hog wild for horsepower by bolting on a handmade set of Kooks Street Headers. Expertly engineered to unleash insane amounts of power, these custom exhaust headers are constructed from premium steel with a 3/8” flange and hand-ground ports. Lifetime Warranty.
Manifold shmanifold—swap that factory iron for some gnarly power & sound with Stainless Works Headers. Crafted from T304 stainless steel and tuned specifically for your engine, these exhaust headers deliver free-flowing horsepower, torque and throttle response. Limited Lifetime Warranty.
Clear away the restrictions in your exhaust system and crank up your driving excitement with Flowmaster Scavenger Series Elite Headers. Each custom-designed exhaust header boasts ceramic-coated stainless steel construction, fat 3/8" flanges and 1 5/8" primary tubes. 1-year warranty.
Banks TorqueTube Exhaust Headers don’t just improve exhaust flow—they actually scavenge the spent fumes out of your motor. Banks’ stainless steel headers free up loads of gut-wrenching torque. Dead-flat flanges and clean welds prevent leaks. Lifetime Warranty.
Making your truck or SUV gallop ahead of the team is what smog-legal PaceSetter Shorty Headers are all about. Specialized engineering, quality steel and durable coatings help PaceSetter performance headers bring power, efficiency and sound. PaceSetter exhaust headers carry a 3-year warranty.
Open the performance floodgates with custom-designed aFe Twisted Steel Headers. These dyno-tested exhaust headers use optimized stainless steel tubes and mitered collectors to cut turbulence and speed up exhaust flow for hair-raising power gains. Gasket included. Lifetime Warranty.
Not sure which 2003 GMC Sierra Exhaust Headers & Manifolds are right for you? We have over 918 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Great product. Used customer sevice very fast service, obuve and beyond. Results big performance differance mpg not tested yet." —Daren T from Cape Canaveral, FL bought a JBA Cat4ward Headers for a 2003 GMC Sierra.
"I bought these headers for my 03' GMC Sierra with a 496 in it. I already had a flowmaster cat-back system which sounded nice but these really made it roar. They definitly boosted overal horsepower, and aided the exceleration. They were most notable in the bottom to mid range, but also give a little extra at the top. The only problem is it made my gas mileage go down about a mile, but its a 496, it has bad MPG anyway. They really are very high quality I highly recomend them." —Matthew M from Durango, CO bought a Gibson Exhaust Performance Header for a 2003 GMC Sierra.