GMC 3500 HD Performance Air Intake - Wehrli - High Flow Cast Aluminum - Gloss White - 01-04. This high-flow cast aluminum turbo inlet replaces the restrictive OEM turbo mouthpiece to improve airflow and throttle response on 2001–2004 GMC/Chevrolet 6.6L Duramax LB7 trucks.

Designed and precision CNC-machined by Wehrli, this 4" intake horn offers a smooth transition into the turbo compressor cover and is finished in durable gloss white powder coat. It bolts on without tuning, pairs with aftermarket or stock IHI-style drop-in turbos, and is intended for performance systems that use a 4" boot connection with bead roll. Made in the USA, it includes mounting hardware and an O-ring seal at the turbo face.

Features

• True 4" cast aluminum inlet with smooth flow profile
• Flows up to 40% better than stock (manufacturer spec)
• Gloss white custom powder coat finish; Made in USA
• O-ring turbo seal and included mounting hardware
• Bolt-on upgrade; compatible with factory IHI and many aftermarket drop-in turbos
• Not compatible with OEM intake systems that use a molded, non-removable silicone connection

This intake is a focused upgrade for enthusiasts seeking quicker spool, improved drivability, and better airflow through the turbocharger without unnecessary extras. If you have questions about fitment with your current intake or turbo, give us a call — our parts and tech staff can help verify compatibility and recommend complementary upgrades. We have installation and customization services at both locations: Austin, Texas and Los Angeles, California areas. Call us at 512-982-9393 (TX) or 562-981-6800 (CA).

If you’re considering purchasing 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