Replace the lightweight 16G, leak prone, 1 5/8" OEM passenger side up pipe on your 2011-2016 6.6L LML Duramax equipped Chevrolet Silverado or GMC Sierra 2500 / 3500 HD truck with these heavy duty 11 gauge 2" Stainless up pipe kit. HD Stainless Bellows that will not crack and leak like OEM. Improves exhaust flow which increases turbo spool-up and decreases EGT's. Excellent upgrade for hard working, heavy towing trucks or high performance applications equipped with larger upgraded turbocharger and emissions compliant tuning. Compatible with OEM style exhaust manifolds or WCFab Billet Exhaust Manifold (Part Number WCF100363). INCLUDES GASKETS! - NO Tuning required, bolt on! -Will fit on stock truck no other modifications or upgrades necessary! Replaces the following GM part numbers: 12657012, 12638302, 12644640. Will not work with aftermarket manifolds which alter the exhaust outlet location. Not compatible with LGH Duramax Equipped Express or Savana models.

• Compatible with OEM & WCFab Turbo Down Pipes
• Ductile Iron Cast EGR Connection w/ EGT Sensor Port
• Fully TIG Welded 11 GA Stainless Steel Construction
• Heavy Duty 2" Passenger Side Up Pipe
• Includes Up Pipe and EGR Cooler Gaskets (3pcs)
• Made in USA
• NO TUNING REQUIRED