---tab Description---

Direct-fit 3-inch high-flow downpipe for 2015.5-2016 6.6L LML Duramax Diesel. Replaces the restrictive factory pipe to reduce exhaust backpressure, improve turbo response, lower EGTs, and boost overall truck performance for daily driving and heavy towing.

New Version Upgrades (VS Old Version)

Pipe & Flange Material Upgrade: Old version adopts 201 stainless steel pipe + iron flange, which is prone to rust, oxidation and deformation under long-term high temperature. New version is fully upgraded to 304 stainless steel pipe + 304 stainless steel flange, delivering outstanding corrosion resistance, salt spray resistance and high-temperature durability for longer service life and zero exhaust leakage.
Heat Wrap Upgrade: Old version comes with natural linen-colored fiberglass wrap, which fades, ages and powders easily. New version upgrades to black fiberglass heat wrap, featuring better heat insulation, anti-aging and anti-peeling performance, effectively isolating engine bay heat with a cleaner racing-style appearance.

Key Features

Premium 304 Stainless Steel Pipe: Mandrel-bent smooth pipe wall for maximum exhaust flow, rust and corrosion resistant for all-weather use.
Durable Heat Insulation: Upgraded basalt heat wrap effectively reduces engine bay temperature and protects peripheral parts from heat damage.
Sturdy Iron Flange: Equipped with thickened iron flange, high strength, pressure-resistant and leak-proof, ensures tight and stable installation, no exhaust leakage under high temperature.
Direct Bolt-On Fit: Precisely engineered for 2015.5-2016 LML Duramax, reserves all factory sensor ports, no cutting or drilling required for easy installation.

Color Option

Silver (Raw 304 Stainless Steel)

Brushed metallic finish with classic industrial texture
Easy to clean and maintain, scratch restorable, maximum durability
Ideal for users pursuing long-term use and simple maintenance

Black (High-Temperature Coated)

Sleek matte black racing finish for aggressive modified look
High-temperature resistant coating, no peeling or blistering
Covers minor welding marks for a neater overall appearance
Perfect for truck show and modification enthusiasts

---tab Fitment---

2015.5-2016 Chevrolet Silverado 500 & 3500HD 6.6L Duramax pickup trucks.
2015.5-2016 GMC Sierra 2500 & 3500HD 6.6L Duramax pickup trucks.
Will not fit Cab & Chassis trucks.

---tab Shipping & Returns---

Fast Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy

Easy Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy

2015.5-2016 LML 6.6L Duramax Applicable Products

Upgraded 3'' Downpipe Exhaust for 2015.5-2016 LML 6.6L Duramax Diesel 304 Stainless | SPELAB