Fab9 NC MX-5 / 2.5L Full Aluminum Valve Cover
Premium Replacement Valve Cover for 2.0 MZR & 2.5L Duratec Engines
Upgrade your NC Miata’s engine bay with the Fab9 Full Aluminum Valve Cover—a precision replacement for the factory plastic unit found on the 2.0 MZR and the increasingly popular 2.5L Duratec swap. This lid delivers a dramatic improvement in durability, function, and under-hood aesthetics, especially for you power hungry top mount turbocharger guys.
Available in Silver or Red (Custom coating optional), each cover can be paired with Fab9’s curated selection of anodized hardware options to give your build the exact level of pop you’re looking for. Whether you’re building a track weapon or a clean street car, this is the most premium valve cover option available for the NC platform.
Where competing solutions fall short, Fab9’s valve cover excels. A genuine OEM MAHLE valve cover gasket is included to ensure a perfect seal and long-term reliability—something other aftermarket covers often overlook. Fitment and finish are tight, consistent, and designed to drop directly onto either the 2.0L or 2.5L cylinder head.
A low-profile ORB-to-10mm barb fitting comes standard, allowing you to run your choice of catch can setup or retain the factory PCV routing. No adapters, guesswork, or additional fittings required.
One of the standout features is the high-temperature composite internal baffle. Unlike lower quality option covers using low-grade ABS (which is known to deform or melt into the valvetrain under real-world heat), Fab9’s composite baffle maintains its 3-dimensional shape under extreme conditions. This ensures proper oil separation, prevents vapor pooling, and keeps your PCV system functioning cleanly under hard cornering, track abuse, or daily driving.
If you're looking for the cleanest, safest, and most durable valve cover upgrade for your NC MX-5 or 2.5L swap, this is it.
Key Features
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Direct replacement for NC MX-5 Miata 2.0 MZR and 2.5L Duratec swap engines
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CNC-machined full aluminum construction
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Available in Silver or Red with multiple anodized hardware combinations
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Includes OEM MAHLE valve cover gasket for perfect fit and sealing
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Low-profile ORB-to-10mm barb fitting included (compatible with catch cans or OEM PCV routing)
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High-temperature 3D composite internal baffle for proper oil/vapor separation
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Will not warp, melt, or deform like ABS-based competing covers
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Superior fit, finish, and long-term reliability
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Enhances engine bay aesthetics with a premium motorsport look
1 Review
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Best option out there for 2.5L conversion
I was having a serious problem with heat soak in my engine bay. My cammed 2.5 is pushed fairly hard, and the valve cover became a weak point as the spark plug boss heat up and melt the surrounding plastic, causing misfires and oil blow-by. This valve cover fixed that instantaneously. The finish is gorgeous, the barbed fitting is well thought out and makes catch can install a breeze, as well as creating a much cleaner look if you want to just run a hose to your inlet for recirculation. Beyond impressed, and was well worth the wait.
Side note:
If you have a 2.5 swap, you’ll need the correct seal for your vvt as the seal that comes with the cover does not fit the solenoid used on a 2.5. It’s 10 bucks at any parts store.
