2017-2026 L5P Duramax 2" Stainless Up Pipe Kit for OEM or WCFab Manifolds w/ Gaskets

Up pipes that hold up

The factory L5P up pipes are thin 16 ga, 1-5/8 in. tubes that tend to leak. Wehrli replaces them with heavy-duty 2 in. pipes TIG welded from 11 ga stainless, with stainless bellows that resist cracking.

Wehrli says they flow 26% better than stock, helping spool and lowering exhaust temperatures. They fit the factory manifolds and Wehrli's billet manifolds (WCF100373).

Who it's for

L5P owners with leaking factory up pipes or anyone upgrading the manifolds.

Key specs (per Wehrli)

What's included

• Driver side 2 in. up pipe
• Passenger side 2 in. up pipe
• Four up pipe gaskets

Fitment notes

• Fits 2017-2026 Chevrolet Silverado / GMC Sierra 2500 HD and 3500 HD with the 6.6L L5P Duramax.
• Wehrli says it also fits 2019-up L5D Duramax 4500/5500/6500 medium-duty trucks.
• Replaces GM part numbers 12688021, 12702943, 12681437, 12680270, 12681162, 12674813 and 12676611.
• California: Wehrli does not ship this part to California.

Professional install available at Powertech Diesel, Idaho Falls — call 208-542-7793.