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Wehrli's 2" stainless up-pipe kit for 2001–2004 LB7 Duramax single-turbo applications replaces the thin, leak-prone 1 5/8" OEM up pipes with heavy-duty 11-gauge 2" stainless pieces and durable bellows to prevent cracking. Designed to work with OEM or WCFab billet exhaust manifolds, the up pipes increase turbo spool-up and reduce EGTs. Fully TIG welded and supplied with gaskets, these up pipes are made in the USA and may require compatible downpipe routing; they do not fit with unconventional manifold or downpipe layouts.
Wehrli 01-04 Chevrolet 6.6L Duramax LB7 2in Stainless Up Pipe Kit w/Gaskets - Single Turbo
