Upgrade your 2011–2016 Duramax LML with the WCFab 4" Stage 2 Intake Kit with Airbox (WCF100304), engineered to significantly improve airflow, turbo efficiency, and overall engine performance. This intake system features a large 4-inch aluminum intake pipe, sealed aluminum airbox, and high-flow dry air filter designed to reduce restriction and allow your turbocharger to pull cooler, denser air for improved horsepower, torque, and throttle response.
The Stage 2 intake includes a high-flow turbo intake horn that removes the restrictive factory intake horn and resonator, improving turbo spool, top-end power, and delivering a more aggressive turbo sound. The sealed airbox draws cold air from the inner fender while protecting the filter from engine bay heat and debris, helping maintain lower intake temperatures and consistent performance.
Constructed from aluminum with durable powder coat finishes and high-quality silicone boots and stainless T-bolt clamps, this intake system is built for durability, performance, and easy installation. This is a direct bolt-on upgrade that installs with basic hand tools and requires no tuning.
Features
- 4" high-flow aluminum intake pipe
- Sealed aluminum airbox and lid
- High-flow dry air filter
- Includes high-flow turbo intake horn
- Improves turbo spool and throttle response
- Increases horsepower and torque
- Draws cold air from inner fender
- Silicone boots and stainless T-bolt clamps
- Bolt-on installation
- No tuning required
- Made in the USA
- Available in multiple powder coat colors
Benefits Over Stock Intake
This Stage 2 intake system offers major airflow improvements compared to the factory intake system and intake horn, helping the engine breathe easier and improving overall performance and efficiency.
Fitment
2011 – 2016 Chevy Silverado 2500HD / 3500HD
2011 – 2016 GMC Sierra 2500HD / 3500HD
6.6L Duramax LML
Notes
- 2011 trucks may require updated PCV valve for fitment
- Not compatible with some aftermarket Y-bridges that relocate intake inlet
- Cannot ship to California