Wehrli Stage 2 4" Intake Kit for 2004.5–2005 Duramax LLY replaces restrictive factory parts with all-aluminum 4" piping and an air box, and includes a 4.8" cast aluminum turbo intake horn to improve turbo spool and top-end power while removing the factory resonator. The kit ships with a dry filter, hydrophobic pre-filter cover, silicone boots, stainless T-bolt clamps and installation hardware for a bolt-on upgrade with no tuning required.
Wehrli 2004.5-2005 LLY Duramax 4in Intake Kit with Air Box Stage 2 Gloss Black