Have you ever wanted a 425 WHP Duramax LLY? Well look no further, Jake has you covered. In today’s video, Jake goes over a comprehensive guide on the top four modifications, and supporting modifications, needed to skyrocket your Duramax LLY's horsepower. From a turbo inlet manifold to ECU & TCU tuning, he covers each mod, explaining how they work together to achieve that 425 WHP. Whether you're a seasoned diesel enthusiast or just starting your journey into the world of truck performance tuning, this video is designed to guide you through each step of the modification process.

If you would like to read up more on this topic, we have an article on our Chevy Trucks website: https://chevytrucks.org/duramaxllym...

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00:19 – Duramax LLY Mods Intro
01:39 – LLY Duramax Stock Power Limits
02:33 – How to Build a 425 WHP Duramax LLY!
04:11 – The Best Duramax LLY Upgrades #1 – Turbo Inlet Manifold
05:04 – The Best Duramax LLY Upgrades #2 – Cold Air Intake
06:01 – The Best Duramax LLY Upgrades #3 – ECU & TCU Tuning
06:47 – The Best Duramax LLY Upgrades #4 – Exhaust System
08:14 How to Build a 425 WHP Duramax LLY Summary w/ costs!
09:11 – Other LLY Duramax Supporting Mods to Consider
10:14 – Duramax LLY Mods Outro