Pacific Performance Engineering 116122005 L5P Duramax Driver Side Replacement Up-Pipe for OEM Exhaust Manifold

The Pacific Performance Engineering (PPE) 116122005 is a driver-side replacement up-pipe engineered specifically for the GM 6.6L L5P Duramax engine using the factory OEM exhaust manifold. Designed as a significant upgrade over the stock up-pipe, this PPE unit delivers improved exhaust flow, faster turbo response, and greater durability for both daily drivers and performance builds.

Key Features:

• 53% greater exhaust flow compared to the factory stock up-pipe
• Direct bolt-on replacement to factory OEM exhaust manifolds — no modifications required
• Constructed from 11-gauge 304 stainless steel with a .120-inch wall thickness and 2-inch OD for maximum strength and corrosion resistance
• Features a PPE 304 stainless steel internally sleeved bellow designed to withstand high temperatures and high-pressure exhaust conditions
• Free-flowing stainless steel inner liner bellow for improved exhaust scavenging
• Delivers faster turbo spool response and lower exhaust gas temperatures (EGTs)
• Significant reduction in exhaust back-pressure

Important Notes:

• This up-pipe is designed for use with the OEM (factory) exhaust manifold — it is not compatible with PPE performance exhaust manifolds (see PPE part 116120005 for that application)
• Gaskets are not included and must be purchased separately
• Note: The L5P up-pipe flange bolt pattern differs from earlier Duramax generations and is not interchangeable with pre-2017 up-pipes

PPE's replacement up-pipes are a direct upgrade for anyone looking to restore or improve exhaust flow on their L5P Duramax without replacing the factory manifolds. Built from premium stainless steel materials, this up-pipe is engineered to outlast OEM components while delivering measurable performance gains.