Wehrli Custom Fabrication WCF100199 Duramax Up Pipe Bolt Kit - L5P

The Wehrli Custom Fabrication WCF100199 Up Pipe Bolt Kit provides a critical upgrade for 2017-2024 GM 6.6L Duramax L5P engines, replacing the failure-prone factory fasteners with high-strength ARP hardware. The stock 8mm bolts used to connect the up pipes to the exhaust manifolds and turbocharger pedestal are known to seize or break, even on low-mileage trucks in rust-free environments.

Kit Includes:

• 12 high-strength ARP fasteners specially selected for this application
• 12 matched washers engineered for proper load distribution
• ARP assembly lube for optimal torque and longevity

Key Benefits:

• Prevents common failures associated with undersized OEM 8mm fasteners
• Provides peace of mind and improved serviceability for stock or modified trucks
• Cost-effective upgrade developed from extensive performance testing
• Simple installation using basic hand tools

This bolt kit addresses a known weakness in the L5P platform that Wehrli Custom Fabrication discovered during extensive performance development work. Whether maintaining a stock truck or building a high-performance application, these upgraded fasteners ensure reliable connections in the critical exhaust system.