Supertech B58 3.0 Intake/Inlet Engine Valve - Black Nitrided 28.5mm Head, 5.95mm Stem - TIVN-1058 - BMW M140i M240i 340i M340i 440i M440i 540i 640i 840i X3/X4/X5/X6/X7 40i Z4 M40i - Toyota GR Supra A90 MK5 Replacement/Performance Upgrade

Supertech TIVN-1058 28.5 mm Inlet Valve - Black nitrided - BMW B58 3.0 and Toyota GR Supra A90

Refresh or upgrade your B58 straight-six with the Supertech TIVN-1058 inlet valve. Engineered for smooth sealing, long service life and consistent performance in turbocharged use, this black nitrided valve is a superb choice for spirited road cars, tuned builds and track projects across BMW and Toyota platforms. We run these on our own MJ Modifications builds and customer engines with excellent results for fit, finish and reliability.

Key reasons to choose this inlet valve

• Black nitrided surface - reduced friction and wear for durability under heat and load
• Ultra-smooth stem finish - stable seating at higher rpm and improved longevity
• Precision manufactured by Supertech - OE-style fit with performance head work
• Ideal for cylinder head refresh, engine rebuilds and uprated valvetrain packages

Specifications

• Head diameter: 28.5 mm
• Stem diameter: 5.95 mm
• Overall length: 100.1 mm
• Part number: TIVN-1058

Vehicle applications

Suitable for BMW and Toyota models using the B58 3.0 litre turbo engine, including but not limited to:

• BMW M140i, M240i, 340i, M340i, 440i, M440i, 540i, 640i, 840i
• BMW X3 M40i, X4 M40i, X5 40i, X6 40i, X7 40i
• BMW Z4 M40i G29
• Toyota GR Supra A90

If you are unsure about suitability for your exact variant, contact us and we will be happy to help.

What you receive

1 x Supertech TIVN-1058 black nitrided inlet valve

Fitting and supporting parts

Professional installation is recommended. We offer in-house fitting at MJ Modifications in Warwickshire - request a quote at info@mjmodifications.co.uk.

For assembly, pair with the correct accompanying components:

• Supertech BMW Ford Vauxhall 5 mm Valve Lock - 7 Degrees
• Supertech BMW Toyota B58 5 mm Intake Valve Stem Seal

Why buy from MJ Modifications

Trusted by enthusiasts and tuners, we use these Supertech valves across our own B58 projects and customer cars. Feedback on fitment quality, sealing consistency and durability has been consistently positive, making this a go-to choice for anyone rebuilding a head or upgrading the valvetrain on a B58-powered BMW or A90 Supra.

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Manufacturer: Supertech