HSP Diesel One Piece Cast Manifolds for 2001-2016 Chevrolet/GMC Duramax

If you own a Chevrolet or GMC Duramax from 2001 to 2016, you know that factory components can often hold you back from achieving the power and reliability you crave. Enter the HSP Diesel Coated Billet Manifolds—a game-changer for those looking to enhance their Duramax’s performance and longevity.

Why Upgrade to HSP Diesel Manifolds?

The stock manifolds are notorious for their restrictive design, which can limit airflow and overall engine performance. HSP Diesel recognized this issue early on, and their one-piece cast manifolds not only tackle airflow restrictions but also address common failures like cracks, warping, and broken bolts. Upgrading to these manifolds means you’re not just improving performance; you’re investing in durability and reliability.

What Sets HSP Diesel Manifolds Apart?

Crafted from high-strength steel and finished on a 5-axis CNC machine, these manifolds are engineered for a precise fit and optimal flow. Here’s what makes them a must-have:

• Open Port Design: Maximizes airflow by eliminating the common restrictions found in factory driver-side manifolds.
• One-Piece Construction: Unlike multi-piece welded designs, the HSP manifolds offer superior strength and resistance to cracking and warping.
• Low-Profile Form: Provides extra clearance for custom routing, making it easier to fit into modified setups.
• Ceramic Coating: Rated for heat protection up to 2,000°F, this coating ensures that your manifolds stay cool under pressure.

What’s Included in the Kit?

• (1) LB7-LML One Piece Manifold - Driver (HSP-IN-660-D)
• (1) LB7-LML One Piece Manifold - Passenger (HSP-IN-660-P)
• (2) 1/8 Inch NPT Brass Plugs (RFB-811-RFAB)
• (1) Manifold Gasket Set (RFB-820-RFAB)
• (12) M10x1.5x25mm Socket Head Cap Bolts (RFB-833-RFAB)
• (14) M10x1.5x35mm Bolts (RFB-834-RFAB)
• (1) M10x1.5x80mm Bolt (RFB-859-RFAB)
• (1) M10x1.5x100mm Bolt (RFB-860-RFAB)

Fitment

These manifolds are specifically designed for the following Duramax engine codes:

• LB7: 2001-2004 (VIN Code 1)
• LLY: 2004.5-2005 (VIN Code 2)
• LBZ: 2006-2007 (VIN Code 2 or D)
• LMM: 2007.5-2010 (VIN Code 6)
• LML: 2011-2016 (VIN Code 8)

Customer Feedback

Owners of the 2006 Chevrolet Silverado 2500 have reported significant improvements after installing the HSP manifolds. One customer noted, “After putting these on, my truck feels like a whole new beast. The throttle response is sharper, and I’ve noticed a drop in EGTs during towing.”

Another GMC Sierra 3500 owner said, “The install was straightforward, and the fit was perfect. I can finally push my Duramax without worrying about the stock manifold crapping out on me.”

Final Notes

Remember, the engine code is determined by the 8th character of your VIN, and the 10th character indicates the model year. Make sure you verify your vehicle's specs before ordering to ensure a perfect fit.