---tab Description--- Up-pipes and down-pipes – what do they do? Up-pipe is a piping that connects the exhaust manifold with the turbo. Exhaust gases enter the turbo from the up-pipe. Down-pipe is a piping that connects the turbo with the rest of the exhaust pipe. Exhaust gases leave the turbo from the down-pipe. For those looking to enhance their Duramax's performance, consider our LML delete kit and Duramax delete kit for optimal results. Key Features Eliminates Leaks - Deletes failure-prone OEM flex joint for a permanent seal. Faster Turbo Spool - Improves exhaust flow to reduce lag and increase throttle response. Durable Stainless - Mandrel-bent construction resists heat and corrosion. ---tab Fitment--- 2001-2004 Chevrolet GMC LB7 6.6L Duramax Diesel 2004.5-2005 Chevrolet GMC LLY 6.6L Duramax Diesel 2006-2007 Chevrolet GMC LBZ 6.6L Duramax Diesel 2007.5-2010 Chevrolet GMC LMM 6.6L Duramax Diesel 2011-2016 Chevrolet GMC LML 6.6L Duramax Diesel Not compatible with LGH Duramax Equipped Express or Savana models. ---tab FAQ--- Q1: What is the function of an up-pipe in a Duramax engine? A1: The up-pipe connects the exhaust manifold to the turbocharger, allowing exhaust gases to enter the turbo and generate boost for improved performance. Q2: Is this LB7 up-pipe compatible with my 2001-2004 Duramax? A2: Yes, this up-pipe is specifically designed for 2001-2004 LB7 6.6L Duramax engines in Chevrolet and GMC trucks. Q3: Will this LBZ up-pipe work with my 2006-2007 Duramax? A3: Yes, this LBZ up-pipe is a direct replacement for 2006-2007 Chevrolet/GMC LBZ 6.6L Duramax engines. Q4: Does this LML up-pipe fit 2011-2016 Duramax models? A4: Yes, the LML up-pipe is designed to fit 2011-2016 Duramax trucks but is not compatible with LGH Duramax models in Express or Savana vans. Q5: Is this LLY up-pipe a direct bolt-on replacement? A5: Yes, the LLY up-pipe fits 2004.5-2005 Chevrolet/GMC LLY 6.6L Duramax and installs directly in place of the stock pipe with no modifications required. Q6: What material is the SPELAB up-pipe made of? A6: The SPELAB up-pipe is made from high-quality stainless steel with a durable black coating for corrosion resistance and long-term performance. Q7: Does this up-pipe include gaskets? A7: Yes, this Duramax up-pipe comes with high-quality gaskets for a secure and leak-free installation. Q8: What are the benefits of upgrading my stock Duramax up-pipe? A8: Upgrading to a performance up-pipe improves exhaust flow, reduces turbo lag, enhances boost response, and increases overall engine efficiency. Q9: Can I use this LML up-pipe with a Duramax delete kit? A9: Yes, this up-pipe works well with LML delete kits and other Duramax performance upgrades for improved exhaust flow and power. Q10: How difficult is the installation of this Duramax up-pipe? A10: Installation requires mechanical expertise and may take a few hours. Professional installation is recommended for best results. ---tab Shipping & Returns--- Fast Shipping Policy Your order will...