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Upgrade your 2017–2023 Chevrolet/GMC Duramax 6.6L L5P with the Polar Diesel 4" Exhaust System with Muffler. Made from high-grade T409 stainless steel, this downpipe-back system enhances exhaust flow, reduces EGTs, improves fuel efficiency, and delivers more horsepower and torque. Engineered for precise fitment, it includes pre-bent exhaust hangers, stainless lap joint clamps, and a quality muffler for smoother, quieter performance on the road or under load.
Trusted by diesel owners across Canada and the USA for durability, performance, and fitment excellence.
Looking for proven diesel performance parts that actually fit and perform? We stock hand-selected upgrades for Duramax, Cummins, and Powerstroke platforms — no guesswork, no junk.
From tuning and exhaust to suspension, engine internals, and recovery gear, everything we carry is backed by real-world testing and used by builders who know what works. If it’s on our site, it’s here for a reason.
