3.5" Cold Side Intercooler Pipe

Replace the later L5P rubber/plastic cold-side pipe with a one-piece 3.5-inch aluminum assembly. Its upper billet adapter and lower machined flange use double O-ring sealing, while a threaded bung retains the intake-temperature sensor.

Features & included components

• 14-gauge aluminum
• Black anodized billet adapter
• Silicone boot, stainless T-bolt clamps and O-rings
• Powder-coat color choices
• No tuning required on the stated stock setup

Fitment & installation notes

2020–2026 Chevrolet Silverado/GMC Sierra 2500/3500 HD 6.6L L5P Duramax; passenger/cold-side pipe. Specify the vehicle model year when ordering.

Replaces GM 23420958 and 84682179.

Shipping restriction: Not available for shipment to California.

Manufacturer part number: WCF100381

Fitment: 2020–2026 Chevrolet Silverado/GMC Sierra 2500/3500 HD 6.6L L5P Duramax; passenger/cold-side pipe. Specify the vehicle model year when ordering.