Chevrolet Silverado 3500 HD Intercooler Pipe - Passenger Side, Wehrli 3 in. High Flow Upper Crossover in Bengal Grey for 2011-2016 Duramax LML. A direct bolt-on designed to improve airflow and turbo response while retaining OEM connections.

Built from 14-gauge aluminum with a Bengal Grey powder coat, this upper crossover replaces GM 12642321 and interfaces with the OEM Y-Bridge, throttle valve, and grid heater. The included billet turbo resonator plate deletes the factory resonator for a cleaner bay and a more pronounced turbo note. Suited for stock trucks—no tuning or extra mods required. Installs with basic hand tools.

Features

• 3 in. high-flow passenger-side upper crossover pipe
• 14-gauge aluminum, Bengal Grey powder coat
• Includes billet turbo resonator plate
• Works with OEM Y-Bridge, throttle valve, grid heater
• Approx. 18% airflow gain vs. stock; bolt-on; Made in USA

Have questions or planning a build? Call our Austin, TX shop at 512-982-9393 (TX) or our Los Angeles area shop at 562-981-6800 (CA). We offer installation and customization services at both locations.

Buying multiple items? Contact us for possible shipping discounts. We install on premises at our Austin and Los Angeles locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov