GMC Sierra 1500 Headers: By Generation and Engine

Headers replace the two cast iron manifolds that come stock on your 5.3L or 6.2L V8 with tuned steel tubes that give each cylinder a smoother, less restrictive path out of the engine. That's the whole idea. More flow out than the stock manifolds moved. Whether you feel it depends a lot on what else you've done to the truck.

There are two header shapes on the market for the Sierra 1500: short tube and long tube. Short tube headers swap in close to where the stock manifolds sit and usually bolt up in an afternoon. Long tube headers reroute the pipes further before reconnecting, which usually means more airflow gain but also a much bigger job, often with a Y-pipe swap and a trip under the truck most people hand to a shop.

RideBuildList earns commissions from some retailer links. The aFe Power Twisted Steel 1-3/4 Inch 304 Stainless Steel Short Tube Header GM Silverado/Sierra 1500 19-26 V8-5.3L/6.2L is the one short tube option in this lineup, built for both the 5.3L and 6.2L on the current-generation Sierra (2019-2026). It's the easier install of the five here, though "easier" for a header still usually means a half day to a full day of work.

Everything else here is a long tube header, and which one fits depends on your chassis generation.

If you've got a 2014-2018 Sierra, the K2XX generation, three of these fit:

The Kooks Headers 1-3/4in x 3in SS Long Tube Headers is built for the 6.2L. Kooks' own page states this specific header fits continuously from 2014 through the newer trucks too, spanning both the older K2XX chassis and the newer T1XX one without a separate part number, which is worth knowing if you're not sure which generation your truck technically is.

The American Racing Headers 1-3/4in Long Tube Headers w/ Catted Y-Pipe (K2XX-era 6.2L) is American Racing Headers' K2XX-era 6.2L long tube with a catted Y-pipe. One thing to flag: ARH's own listing confirms fitment for the Chevrolet Silverado of this generation but does not explicitly confirm the GMC Sierra. The two trucks share nearly everything mechanically, but until that's stated in writing by the manufacturer for the Sierra specifically, check with American Racing Headers directly before you buy this one for a Sierra.

The Stainless Works 1-7/8in Long Tube Headers, Performance Connect (catted) is the one part in this whole lineup confirmed by the retailer, by exact SKU, for both the 5.3L and the 6.2L, and for both the Silverado and the Sierra. If you want one less thing to double check, this is it.

If you've got a 2019-2026 Sierra with the 6.2L, there's also the American Racing Headers 1-3/4in Long Tube Headers, Catted Y-Pipe (6.2L Long System), American Racing Headers' dedicated long tube for the newer chassis rather than a carried-over older part. Keeping the catalytic converters in the Y-pipe keeps it closer to street legal than an off-road-only, cat-less setup.

None of these five publish an independent horsepower or torque number for this exact header on its own product page. That's normal for headers. The gain is airflow, not a single dyno figure, and a lot of what you actually feel shows up after a supporting tune, not from the header by itself.

A quick way to keep these straight:

This is a pick-one decision, not a parts list to stack. You're replacing the manifolds once with whichever header matches your generation, your engine, and how much of a project you want to take on. There's no reason to buy more than one of these for the same truck.

Headers usually come after a cat-back exhaust and an intake on a build, not before them. They're a bigger job for a smaller, harder-to-isolate gain, and most of the five here assume you've already got the easier stuff done or tuned for. If you're just starting out, a cat-back and an intake will usually get you more noticeable change per hour of shop time than any of these. Headers make more sense once you're chasing the next step, especially if a supercharger or a bigger turbo is somewhere on the plan, since the factory manifolds become more of a bottleneck as the air moving through them increases.

A few things worth checking before you buy any of them:

• Confirm your exact build year and engine against the listing. Several of these are engine-specific, and a wrong guess means a part that doesn't bolt up.
• Call the seller directly if your trim and generation combination isn't explicitly listed, especially on the older-chassis ARH part above.
• Budget for a shop. Four of these five are long tube headers with 8 to 10 hour install times most people are better off paying for.
• Plan on a tune afterward if you're chasing a power number. A header changes how air moves. A tune is what actually uses that change.
• Ask about warranty. Swapping manifolds for aftermarket headers is the kind of modification a dealer can point to when denying an unrelated warranty claim, fairly or not, so know where you stand before you cut into a truck that's still under factory coverage.

One more thing that isn't optional: whether a given header keeps your truck emissions compliant is a real legal question, not a style choice, and it varies by state and by whether the header keeps or removes the catalytic converters. Every header here that touches the exhaust path downstream of the manifold is described by its own seller as catted, but that's the seller's claim, not a guarantee for your state. RideBuildList isn't a substitute for checking your own state's emissions rules or talking to a shop that knows them before you buy or install anything. This isn't legal advice.