GMC Sierra 3500 HD Intercooler Pipe – Passenger Side – Wehrli 3 in. High Flow Upper Crossover in Bengal Grey for 2011–2016 LML Duramax. This direct-fit upper pipe increases charge-air volume and reduces restriction for quicker spool and responsive performance.

Built to integrate with the OEM Y-bridge, throttle valve, and grid heater, it installs with basic hand tools and requires no tuning. The included billet turbo resonator plate removes the factory resonator, tidying the bay and letting more turbo sound through. Constructed from 14-gauge aluminum and finished in a durable Bengal Grey powder coat, this pipe delivers approximately 18% airflow gain over stock and replaces GM part number 12642321. Made in the USA.

Features

• Passenger-side 3 in. upper crossover for 6.6L LML Duramax
• Fits 2011–2016 GMC Sierra 3500 HD
• Direct bolt-on; no tuning required
• Works with OEM Y-bridge, throttle valve, and grid heater
• Includes billet turbo resonator plate
• 14-gauge aluminum, Bengal Grey powder coat
• Replaces GM 12642321; made in the USA

Questions or planning a build? Call our Austin shop at 512-982-9393 or our Los Angeles area shop at 562-981-6800. We offer installation and customization services at both locations.

Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.

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