Wehrli 3.5" Downpipe for 2017-2026 Silverado/Sierra 2500HD/3500HD 6.6L Duramax L5P - WCF100129

Key Features & Specs:

• Brand: Wehrli
• Part Number: WCF100129
• Product Type: Downpipe
• Diameter: 3.5 inches
• Material: Steel
• Finish: Black ceramic coated
• Heat Management: Pre-installed heat wrap
• Connection Type: 4-bolt flange
• Design: Catalyst-back, emissions compliant
• Compatibility: Works with OEM exhaust system
• Sensor Ports: Includes bungs for sensors
• Tuning Required: No
• Manufacturing: Made in the USA
• Warranty: 12 month warranty

Fitment:

• 2017-2019 Chevrolet Silverado 2500HD 6.6L Duramax (L5P)
• 2017-2019 Chevrolet Silverado 3500HD 6.6L Duramax (L5P)
• 2017-2019 GMC Sierra 2500HD 6.6L Duramax (L5P)
• 2017-2019 GMC Sierra 3500HD 6.6L Duramax (L5P)
• 2020-2026 Chevrolet Silverado 2500HD 6.6L Duramax (L5P)
• 2020-2026 Chevrolet Silverado 3500HD 6.6L Duramax (L5P)
• 2020-2026 GMC Sierra 2500HD 6.6L Duramax (L5P)
• 2020-2026 GMC Sierra 3500HD 6.6L Duramax (L5P)

Improve exhaust flow and performance with the Wehrli WCF100129 3.5" Downpipe for 2017-2026 L5P Duramax trucks. Designed to replace the restrictive factory crushed downpipe, this upgraded unit features a full 3.5-inch steel construction for increased exhaust efficiency. Finished in a high-temperature black ceramic coating and pre-wrapped for heat management, it helps reduce under-hood temperatures while maintaining durability. This emissions-compliant, catalyst-back design connects directly to the DOC outlet flange and mates with the factory exhaust using a 4-bolt flange connection. Complete with sensor bungs and requiring no tuning, this USA-made downpipe is a direct bolt-on upgrade for improved performance and reliability.