Cast T4 Turbo Exhaust Manifold for GMC Sierra 1500 (1999-2013) 4.8L 5.3L 6.0L 6.2L

High-Durability Cast T4 Turbo Exhaust Manifold for 1999-2013 GMC Sierra (GMT800 / GMT900)

What it Does: The Cast T4 Turbo Exhaust Manifold replaces the factory passenger-side exhaust manifold on 1999-2013 GMC Sierra trucks to mount a T4 turbocharger high in the engine bay for single-turbo forced induction applications.

The Stock GMC Sierra Exhaust Limitation

Factory cast exhaust manifolds on GMT800 and GMT900 trucks are engineered purely for standard atmospheric evacuation, choking high-volume exhaust velocity and lacking any provision for turbocharger integration. While fabricated tubular manifolds provide turbo mounting, they routinely fail on heavy-duty truck platforms: continuous heat cycling, exhaust backpressure, and the physical weight of an unsupported turbocharger cause thin-wall welded stainless tubes to crack at the collector seams. Furthermore, warped fabricated flanges cause exhaust gas leaks that compromise spool time and destroy driveability.

The Engineering Solution

Cast from heavy-duty ductile iron, this passenger-side turbo manifold provides superior thermal retention and mechanical strength, resisting thermal fatigue and structural cracking under prolonged boost. It merges all four passenger-side exhaust runners into an integrated, precision-machined T4 footprint that positions the turbo high and forward for optimal clearance. Exhaust from the driver bank integrates seamlessly via an integrated 2.5-inch V-band crossover flange, delivering an airtight, gasket-free seal that speeds up turbine response on Gen III and Gen IV LS-based truck engines.

What's Included

• 1 Cast T4 Turbo Exhaust Manifold (Passenger Side)

Technical Specifications

Compatibility

• 1999-2013 GMC Sierra 1500 (4.8L, 5.3L, 6.0L, 6.2L Vortec V8)
• Vortec LS engine swap applications utilizing factory truck cylinder heads

Frequently Asked Questions & Fitment Warnings

Does this fit the GMT800 and GMT900 Sierra?

Yes, this is a direct fit for the 1999-2013 GMC Sierra equipped with Gen III and Gen IV Vortec engines; it does not fit 2014+ Gen V EcoTec3 5.3L or 6.2L engines.

Are exhaust manifold hardware and gaskets included with this manifold?

No, mounting bolts and manifold gaskets are not included and must be sourced separately or reused from existing stock hardware.

The GMC Workhorse Caliber

Built to handle the immense thermal strain of high-load towing and high-boost strip applications, this thick cast-iron manifold guarantees zero crack propagation and leak-free reliability across every duty cycle.