Replace the lightweight 16G, leak prone, 1 5/8" OEM driver and passenger side up pipes on your 2011-2016 6.6L LML Duramax equipped Chevrolet Silverado or GMC Sierra 2500 / 3500 HD truck with this 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, 12650925, 12637379. Will not work with aftermarket manifolds which alter the exhaust outlet location. Not compatible with LGH Duramax Equipped Express or Savana models.

• Fully TIG Welded 11 GA Stainless Steel Construction
• Ductile Iron Cast EGR Connection w/ EGT Sensor Port
• Includes Up Pipe and EGR Cooler Gaskets (5pcs)
• Compatible with OEM & WCFab Turbo Down Pipes
• Heavy Duty 2" Passenger Side Up Pipe
• Heavy Duty 2" Driver Side Up Pipe
• NO TUNING REQUIRED
• Made in USA

This Part Fits: