High Flow Bundle Kit Stage 2 for 2020-2023 Duramax L5P Fluorescent Green

The WCFab Stage 2 High Flow Bundle is the ultimate air-management overhaul for your 2020-2026 L5P Duramax. This comprehensive kit combines a full 4-inch cold air intake system with heavy-duty hot and cold side intercooler pipes, eliminating every restrictive plastic component and leak-prone rubber boot between your air filter and the engine. By upgrading to smooth, mandrel-bent 14-gauge aluminum, you’ll see immediate improvements in turbo spool-up, throttle response, and overall engine efficiency. On the intake side, the oversized 4-inch horn and airbox enclosure draw cool air directly from the factory hood ram-air duct and inner fender. After the turbo, the kit replaces the narrow 2.5-inch factory piping with a massive 3-inch driver-side (hot) pipe and a 3.5-inch passenger-side (cold) pipe. Featuring CNC-machined flanges and double O-ring seals, this bundle is engineered to hold higher boost pressures than factory components, making it a "must-have" for both stock trucks and high-performance applications.