The OEM diameter and we experienced a 25HP Gain with our 4 in. turbo inlet when used with a Max Effort Tune. High quality hardware, silicone boot, seals, and stainless steel t-bolt clamps ensure optimum durability and ease of installation. Removable air box lid element allows for easy visual inspection and maintenance of your WCFab filter with included hydrophobic pre-filter cover, to help keep your MAF sensor, turbo, and engine airways contaminant free. The critical ram air duct seal has been moved to the bottom of the hood for a clean engine compartment appearance. After the turbo, our Stage 2 kit also upgrades the restricted 2-piece, resonator equipped, 2.5 in. diameter driver (hot) side intercooler pipe and leak-prone 2-piece plastic / rubber passenger (cold) side pipe with WCFab's heavy duty 3 in. diameter 1-piece Driver (Hot) Side and 3.5 in. diameter Passenger (Cold) Side L5P Intercooler Pipes. Made in the USA from high strength, heavy duty 14 ga. aluminum tube with smooth, aerodynamic mandrel bends for increased durability and optimized flow. 3 in. Driver Side pipe eliminates
Wehrli Custom Fab High Flow Bundle Kit Stage 3, for 2017-2019 Duramax L5P, WCFab Grey

• OEM Clip Ring Design at Y-bridge connection replaced by high quality silicone boot and stainless steel t-bolt clamps for improved sealing and ability to hold higher boost pressures without leaking


• 4 in. Aluminum intake pipe with Air box enclosure, dry filter assembly and Outerwears pre-filter cover, 4 in. Intake horn with PCV port and Surge Ring


• CNC Machined Flange with Double O-Rings provides an improved sealing surface to eliminate boost leaks.


• Silicone Boots, Stainless Steel T-Bolt Clamps, O-Rings, Intercooler Outlet Clip, Installation Hardware


• 3 in. Hot Side Intercooler Pipe & 3.5 in. Cold Side Intercooler Pipe


• 3.5 in. Ceramic Coated Down Pipe with Heat Wrap pre-installed


• Retains factory connection points and sensors


• NO Tuning required, bolt on!


• Custom Powder Coat Finish


• Made In the USA

Vehicle Fitment