Long Exhaust Header For GMC Sierra (2014-2018) with 5.3L 6.2L V8 Engine

Uncork the massive potential of your GM V8 truck and eliminate the flow restriction of the factory log manifolds with this high-flow long tube header and Y-pipe system.

Stainless Steel Long Tube Headers & Y-Pipe for 2014-2018 GMC Sierra 1500 (1-7/8" Primaries)

If you are driving a 2014-2018 GMC Sierra 1500, you are sitting behind a potent V8 engine that is desperately trying to exhale. From the factory, these trucks come equipped with cast iron "log" manifolds designed for quiet operation and rapid manufacturing, not performance. These stock manifolds trap heat, create backpressure, and force your engine to work harder to push exhaust gases out. This stainless steel header package is the ultimate solution to let your LT-based EcoTec3 V8 engine breathe freely.

Featuring massive 1.875" (1-7/8") primary tubes, this kit is sized perfectly for the 5.3L and 6.2L V8s. Unlike smaller 1-5/8" headers that can choke top-end power, the 1-7/8" diameter allows for maximum scavenging at high RPMs without sacrificing low-end torque. This is critical for getting heavy trucks moving or towing loads. The included Y-Pipe connects the headers to your exhaust system, ensuring a smooth, laminar flow from the cylinder heads all the way back.

Durability is key when upgrading exhaust components on a truck. Constructed from stainless steel with substantial 7/16" head flanges, these headers are built to resist warping—a common issue with thinner, cheaper alternatives. The flattening process on the flanges ensures a tight seal against the cylinder head, preventing those annoying exhaust ticks. Whether you are chasing more horsepower on the dyno, a louder, chop-heavy idle, or simply replacing cracked manifolds, this kit delivers the performance and sound your truck deserves.

Why You Need This Upgrade

• Maximum Flow: Large 1.875" (1-7/8") primary tubes reduce backpressure, allowing the engine to scavenge exhaust gases efficiently for big power gains.
• Complete Solution: Includes a matching Y-Pipe to bridge the headers to your exhaust system, eliminating the need for expensive custom fabrication.
• Leak-Free Seal: Heavy-duty 7/16" thick head flanges and 3/8" outlet flanges prevent warping and gasket blowouts under high heat.
• Aggressive Sound: dramatically changes the tone of your V8, turning the muffled stock whisper into a deep, aggressive American V8 roar.
• Stainless Durability: Stainless steel construction withstands the elements and high exhaust temperatures far better than mild steel or cast iron.

Installation Notes

Professional Installation Recommended: Installing long tube headers on 4WD/AWD trucks can be a tight fit, often requiring manipulation around the steering shaft and front driveshaft. No instructions are included in the box. This kit includes the necessary gaskets, exhaust clamps, and head bolts. Note: A professional ECU tune is recommended after installation to maximize power gains.

Vehicle Fitment

• GMC Sierra 1500 2014, 2015, 2016, 2017, 2018 5.3L & 6.2L V8 (2WD/4WD)

Fitment Note: Made for the 2014-2018 K2XX body style with 5.3L or 6.2L V8 engines.

Transform your truck from a restricted daily driver into a high-performance machine—order your Stainless Header and Y-Pipe Kit today.

Common Questions

Will this long tube header kit fit my 2014-2018 GMC Sierra 1500?
Yes, this header and Y-pipe package is built for 2014-2018 GMC Sierra 1500 2WD and 4WD trucks equipped with the 5.3L or 6.2L V8 engine.

Does this fit GMC Sierra 2500 HD or 3500 HD models?
This system is made specifically for the GMC Sierra 1500 with the 5.3L or 6.2L V8 engine.

What is included in the box?
The kit includes stainless steel 1-7/8" long tube headers, a matching Y-pipe, gaskets, exhaust clamps, and head bolts.

What are the tube and flange specifications on these headers?
They feature 1.875" (1-7/8") primary tubes, 7/16" thick head flanges to resist warping, and 3/8" thick outlet flanges.

Are installation instructions included with the kit?
Written instructions are not included in the box. Professional installation is recommended, especially on 4WD trucks where clearance around the steering shaft and front driveshaft is tight.