Stage 2 High Flow Intake Bundle Kit

Features:

• Up to 37% more airflow over stock
• Improves throttle response and turbo spool-up
• High-flow 4" intake pipe and air box
• Includes dry air filter with pre-filter cover
• Precision CNC-machined cast aluminum Y-bridge
• Heavy-duty 14-gauge aluminum pipe construction
• Upgraded silicone boots and T-bolt clamps
• No tuning or additional mods required
• Fully compatible with stock turbos and EGR
• Custom powder coat finish for long-term durability
• Includes 4.8" high-flow turbo intake horn
• Made in the USA

Let Your Turbo Breathe The Way It Should

If you want your LML Duramax to respond quicker, pull harder, and sound better, the Wehrli Stage 2 High Flow Intake Bundle is a no-brainer upgrade. This all-in-one kit replaces the most restrictive parts of your stock intake and intercooler system with larger, high-flow components designed to move serious air. From daily driving to heavy towing, you’ll notice better throttle response, smoother power delivery, and cooler intake temps. The 4-inch intake pipe and custom aluminum air box pull cold air through the fender to give your turbo more of what it needs. Plus, the included pre-filter cover helps keep debris out while adding extra protection to your dry filter. You’ll also love the more aggressive turbo whistle and cleaner look under the hood, thanks to the billet resonator delete and color-matched powder coating. Best of all, this entire setup bolts right onto a stock truck with no tuning required. It’s a solid upgrade that delivers noticeable gains without the hassle.

Designed To Push More Air With Less Restriction

This Stage 2 kit combines Wehrli’s proven Stage 1 Intercooler Piping System with their high-flow cold air intake and turbo inlet horn, creating a complete airflow solution for 2011-2016 LML trucks. The 3-inch and 3.5-inch intercooler pipes replace weak factory units that are known to split under boost, while the CNC-machined Y-bridge improves distribution into the intake runners and heads. You also get a larger 3-inch crossover pipe that matches the increased diameter of the Y-bridge inlet, reducing turbulence and increasing total airflow by 33 percent. The 4-inch aluminum intake pipe and sealed air box with 10-gauge construction deliver 37 percent more air to the turbo than stock, pulling in cooler, denser air from the inner fender. A 4.8-inch cast turbo intake horn further removes bottlenecks at the compressor inlet, giving you quicker spool-up and better top-end performance. Heavy-duty silicone boots, T-bolt clamps, and factory sensor compatibility make installation straightforward and reliable. It’s engineered for durability and performance whether you're hauling trailers, tuning for power, or just want a more responsive truck.

Fitment: 2011, 2012, 2013, 2014, 2015, 2016 GM Sierra/Silverado 2500HD/3500HD LML Duramax

Notes:

• Compatible with 2011-2016 LML Duramax 2500HD/3500HD
• 2011 models will need a PCV Valve*
• Combines Stage 1 and Stage 2 upgrades in one kit
• No tuning or additional modifications required for install
• Fully compatible with factory EGR, throttle valve, and intake runners
• Works with stock and drop-in VGT style turbochargers
• Includes sealed air box with dry filter and pre-filter cover
• Improves engine sound and under-hood appearance
• Intended for emissions-compliant performance setups
• Eliminates common factory failure points in the intake system
• Custom powder coat color options available
• Made in the USA using high-quality aluminum and hardware
• Not legal for sale or use in California (Prop 65 warning)