MBRP GM8436 Armor BLK 3.5-Inch Down Pipe Black-Coated Aluminized Steel L5P Duramax 6.6L

The MBRP GM8436 Armor BLK Down Pipe is a direct-replacement turbocharger down pipe engineered for the L5P Duramax 6.6L diesel engine. Built from black-coated aluminized steel, this 3.5-inch down pipe replaces the restrictive factory unit to improve exhaust flow, reduce exhaust gas temperatures (EGTs), and enhance overall engine performance.

Connecting between the turbocharger and the rest of the exhaust system via a V-band flange to four-bolt flange configuration, the GM8436 is a direct OEM-style replacement that simplifies installation while delivering measurable performance gains. The ceramic black coating provides excellent heat resistance and corrosion protection for long-lasting durability.

Key Features:

• 3.5-inch diameter tubing for increased exhaust flow over the factory pipe
• Armor BLK ceramic black coating for high-temperature resistance and a clean appearance
• Black-coated aluminized steel construction for durability and corrosion resistance
• V-band flange to four-bolt flange design for a secure, leak-free connection
• Up to 11% flow increase over the restrictive OEM down pipe
• Approximately 3 lb weight savings compared to the stock unit
• Comes with exhaust wrap pre-installed
• Direct OEM replacement — no cutting or modification required
• Not CARB legal — not for sale or use in California

The MBRP GM8436 is backed by a 1-year warranty and is part of MBRP's Armor BLK lineup, designed for diesel truck enthusiasts seeking proven performance upgrades for the L5P Duramax platform.