Shorty Exhaust Header for GMC Sierra (2007-2013) 4.8L 5.3L 6.2L

High-Flow Stainless Shorty Exhaust Headers for 2007-2013 GMC Sierra (GMT900)

What it Does: The Shorty Exhaust Header replaces the restrictive factory cast-iron exhaust manifolds on the 2007-2013 GMC Sierra to scavenge exhaust gases efficiently, reduce backpressure, and increase torque output across the mid-range powerband.

The Stock GMC Sierra Manifold Failure Points & Exhaust Restrictions

Factory cast-iron manifolds on the GMT900 platform are notorious for exhaust leaks caused by sheared rear manifold bolts, warpage from uneven thermal cycles, and severe port restriction. The OEM log-style architecture forces adjacent cylinders to dump directly into a turbulent common plenum, creating excessive exhaust backpressure and cylinder heat retention. Over time, the combined stress of towing loads and engine vibration leads to cracked castings, blown flange gaskets, and degraded exhaust velocity on factory Gen IV Small Block engines.

The Engineering Solution

These shorty exhaust headers eliminate structural cracking and gas reversion by utilizing smooth-flowing 1.75-inch primary tubes in an 8-2 layout feeding into a 2 3/8-inch collector outlet. Fabricated from heavy-gauge stainless steel with a high-luster 3-stage polish finish, the runners are joined with precision TIG and MIG welds to endure sustained exhaust gas temperatures. A heavy-duty 7/16-inch CNC-machined cylinder head flange resists heat cycling distortion to prevent blowouts, while the 3/8-inch collector flange guarantees a positive seal to downpipes. Integrated dual O2 sensor bungs allow plug-and-play installation without custom wiring or air-fuel monitoring errors.

What's Included

• 2 Stainless Steel Exhaust Headers
• Exhaust Manifold Gaskets

Technical Specifications

Compatibility

• 2007-2013 GMC Sierra 1500 4.8L V8
• 2007-2013 GMC Sierra 1500 5.3L V8
• 2007-2013 GMC Sierra 1500 6.2L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT900 Sierra?

Yes, this is a direct bolt-on fit for the 2007-2013 GMC Sierra equipped with the 4.8L, 5.3L, and 6.2L Gen IV V8 engines.

Will installing these shorty headers require an ECU tune?

No, an ECU re-tune is not mandatory since primary oxygen sensor positions and factory collector locations are retained, though custom tuning maximizes gains.

The GMC Heavy-Duty Hauling Caliber

Engineered to handle the high thermal stress of towing payloads and continuous hill climbs, these headers deliver the structural durability and uninhibited scavenging flow required to keep your Sierra running cool and strong under load.