PPE 116121115 OEM Length High Flow Up-Pipes | 2011-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Features: - Increases exhaust flow by 53% - Constructed from 11-gauge 304 stainless steel - Internally-sleeved bellows for added durability - Handles high temperatures and pressure extremes - Direct bolt-on fit to factory manifolds - Improves turbo response and efficiency - Designed for 2011–2016 6.6L LML Duramax - Stronger than factory OEM up-pipes - CARB compliant in all 50 states - Legal for street use under EO# D-701-33 - Ideal for stock or modified diesel engines - Reduces risk of exhaust leaks and failure Upgrade Your Flow Without Compromising Street Legality If your stock up-pipes are starting to show their age or you're chasing better flow and power, the PPE High Flow OEM-Length Up-Pipes are a serious step forward. These aren’t just replacements, they’re a performance-focused upgrade built to handle the abuse of heat, pressure, and time. Whether you're running your LML Duramax stock or tuned, these up-pipes give you 53% more exhaust flow than factory parts, which means improved turbo spool, better throttle response, and more efficient power delivery. The 11-gauge 304 stainless steel construction is far tougher than what your truck rolled off the lot with, and it’s built to last through years of hard use. Even better, they’re 50-state legal with CARB EO# D-701-33, so you can run them with confidence on or off the street. It’s a simple bolt-on install that adds performance and durability without requiring a full custom setup. If you want your truck breathing better without jumping through hoops, this is the way to go. Built To Withstand What Stock Up Pipes Cannot The PPE 116121115 OEM-Length High Flow Up-Pipes are engineered for durability and efficiency in high-performance diesel applications. Designed specifically for 2011–2016 GM Silverado and Sierra 2500HD and 3500HD trucks with the 6.6L LML Duramax engine, these pipes feature internally-sleeved bellows that provide added strength under extreme heat and pressure. Unlike thin OEM pipes that fatigue over time, PPE uses 11-gauge 304 stainless steel to ensure long-term reliability and resistance to cracking or failure. With a 53% increase in flow capacity over stock, these up-pipes significantly reduce backpressure and improve turbocharger performance without requiring tuning or major modification. The design remains true to OEM length and routing, allowing for a seamless installation using the factory manifold connection points. This makes them ideal for emissions-compliant upgrades and daily-driven trucks that need both performance and legal assurance. Backed by PPE’s reputation for quality, these up-pipes are built to outlast and outperform what came from the factory. Fits: 2011, 2012, 2013, 2014, 2015, 2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML Notes: - CARB compliant and legal in all 50 states - CARB Executive Order Number: D-701-33 - Designed for 2011–2016 6.6L Duramax LML engines - Provides 53% more exhaust flow than stock up-pipes - Constructed from heavy-duty 11-gauge 304 stainless steel - Internally-sleeved bellows improve durability and heat resistance - OEM length and routing for direct bolt-on fitment - Reduces exhaust backpressure and improves turbo efficiency - Suitable for both stock and performance applications - Helps prevent premature failure common with factory up-pipes - Ideal for emissions-compliant upgrades and daily drivers - Professional installation recommended for best fit and sealing