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Wehrli's 2" stainless up-pipe kit replaces the OEM 1 5/8" up pipes on 2001–2004 LB7 Duramax twin-turbo engines with heavy-duty 11-gauge 2" stainless components and high-duty bellows that avoid cracking and leaks. Intended for twin-turbo or compound setups with factory or WCFab billet exhaust manifolds, the full-flow design eliminates clearance dents and tight bends, improving turbo spool-up and reducing EGTs. These up pipes are fully TIG welded, include gaskets, and are made in the USA; they will not clear a conventional downpipe routed behind a valley-mounted turbo.
Wehrli 01-04 Chevrolet 6.6L Duramax LB7 2in Stainless Up Pipe Kit w/Gaskets - Twin Turbo
