GM Duramax LML - CCV Upgrade Kit (2012-2016)
GM Duramax LML - CCV Upgrade Kit (2012-2016)
Take control of crankcase pressure and keep your intake system clean with this CCV Upgrade Kit for your 2012-2016 LML Duramax. The factory crankcase ventilation system is known to dump oily vapor back into the intake, leading to carbon buildup and reduced performance. This upgrade vents blow-by properly, eliminates the bulky CCV box, and frees up valuable engine bay space—all while giving your setup a cleaner, more streamlined look.
Key Features:
- Vents Blow-by Pressure: Helps reduce crankcase pressure buildup for better engine health and performance.
- Keeps Intake Tract Clean: Prevents oil mist from coating your intercooler and intake piping, preserving airflow and throttle response.
- Deletes Factory CCV Box: Removes the unsightly OEM crankcase box, opening up room for easier maintenance and upgrades.
- Streamlined Hose Routing: Simplifies your engine bay with a clean, direct hose setup.
- Black Anodized Plates: Machined aluminum with a sleek black finish—built to last and look sharp doing it.
Why Upgrade Your CCV System?
On tuned or high-mileage trucks, crankcase pressure can become a serious issue. The factory system recirculates this pressure—along with oil mist—back through your turbo and intercooler. That leads to sludge, reduced efficiency, and long-term reliability problems. This CCV Upgrade Kit fixes the problem at its source, giving your Duramax cleaner airflow and better breathing.
Compatibility:
- 2012, 2013, 2014, 2015, 2016 GMC Sierra 2500HD/3500HD 6.6L Duramax LML
- 2012, 2013, 2014, 2015, 2016 Chevy Silverado 2500HD/3500HD 6.6L Duramax LML
Cleaner Look. Cleaner Performance.
This CCV Upgrade Kit is designed for performance, reliability, and ease of install. With anodized hardware and improved routing, it’s a smart upgrade that pays off in both form and function.
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Important Notices
- Off‑Road Use Only
Products sold by JS Speed are intended for off‑road use and may be illegal on public roads where emissions or pollution‑control laws apply. - Check Local Laws
Before purchasing or installing, verify all applicable local, state/provincial, and federal regulations to ensure the modification is legal in your area. - Professional Installation Recommended
These parts should be installed by qualified professional mechanics. Improper installation can cause performance issues or vehicle damage. Unless a product page explicitly states otherwise, installation instructions are not included. Components are designed for users with solid mechanical knowledge, and minor adjustments or modifications may be required for proper fitment. Returns or refunds cannot be accepted due to difficulty completing an installation or the absence of instructions. - Warranty Impact
Use of these parts may void your vehicle’s factory warranty. Confirm with your vehicle manufacturer before purchase and installation. - Limitation of Liability
JS Speed is not responsible for damage, failures, or issues arising from the use or installation of these products. - Product Images
Images are for illustration only and may differ from the actual product due to manufacturer updates or improvements. - No Performance Guarantees
While these products are designed to enhance performance, JS Speed does not guarantee specific performance results.



