2001-2004 LB7 Duramax 2" Stainless Twin Turbo Up Pipe Kit for OEM or WCFab Manifolds w/ Gaskets

Up pipes for twin-turbo LB7s

The factory LB7 up pipes are thin 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 help spool and lower exhaust temperatures.

This set is for compound and twin turbo setups. The two sides are nearly symmetrical, with no clearance dent or tight bends for a valley-mount single-turbo downpipe, so they flow fully but will not clear a conventional downpipe routed behind the engine.

Who it's for

LB7 owners running a compound or twin turbo setup.

Key specs (per Wehrli)

What's included

• Driver side 2 in. up pipe
• Passenger side 2 in. up pipe for compound / twin setups
• Four up pipe gaskets

Fitment notes

• Fits 2001-2004 Chevrolet Silverado / GMC Sierra 2500 HD and 3500 with the 6.6L LB7 Duramax.
• For twin turbo setups only; will not clear a standard single-turbo downpipe.
• California: Wehrli does not ship this part to California.

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