Supertech Performance MAIVN-2301D-6MM MZR Turbo Black Nitride Intake Valve 35mm

The Supertech Performance MAIVN-2301D-6MM is a high-performance stainless steel intake valve engineered for the Mazda MZR DISI turbocharged 2.3L engine. Built to standard size with a dished face profile, this valve is designed as a direct-fit upgrade that works with the factory OEM valve guides and seals — no additional hardware modifications required.

The valve features a 5.98mm stem diameter sized for stock valve guide and seal compatibility, tapering to 5.5mm at the upper stem to ensure compatibility with both the stock valvetrain and Supertech's upgraded springs and retainers. With a 35mm head diameter and 103.40mm overall length, it matches OEM dimensions precisely for a reliable drop-in fitment.

Key Features:

• Head Diameter: 35.00mm
• Stem Diameter: 5.975mm (tapers to 5.5mm at top)
• Overall Length: 103.40mm
• Material: Enhanced EV8 (21-4N) stainless steel — one-piece forged construction
• Finish: Black nitride coating for increased surface hardness and reduced friction
• Groove Type: Single groove
• Compatible with OEM factory valve guides and seals
• Compatible with Supertech upgraded valve springs and retainers
• Sold individually

Supertech manufactures their valves from an enhanced grade of EV8 (21-4N) stainless steel, one of the highest-grade alloys available for intake valve applications, providing exceptional strength and heat resistance. The black nitride coating is a hardening surface treatment that delivers harder, smoother valve faces for reduced friction and extended service life — ideal for high-boost and high-performance engine builds. Each valve is one-piece forged and may feature hardened tips, hardened seats, swirl polish, and undercut finishing depending on the application.