Supertech B58 Sodium Cooled/Filled Exhaust Valve (Inconel/Nimonic) TEVI-1058-HS / TEVI-1058-HS-12 for BMW 3.0 Turbo & Toyota GR Supra A90 3.0 – M340i 540i 440i M140i M240i M440i Z4 M40i X3/X4/X5 40i 840i – High EGT Poppet/Valvetrain Upgrade

Supertech TEVI-1058-HS Heat-Managed Exhaust Valve for BMW 3.0 Turbo B58 and Toyota GR Supra 3.0

Build your B58 with confidence. This Supertech exhaust poppet valve uses a sodium‑cooled hollow stem and a premium nickel superalloy head to cope with relentless exhaust gas temperatures, sustained boost and fast-road or track abuse. Ideal for hard‑driven G‑series and F‑series 40i models and the A90 Supra 3.0, it is a proven choice for Stage 2 and Stage 3 engine builds, hybrid or big turbo conversions and anyone chasing reliability from the B58 valvetrain.

We run these valves on our own projects and customer cars, and the feedback is consistently excellent. Fit, sealing and durability are exactly what you want when you are pushing a tuned straight‑six.

Why this upgrade works

• Sodium‑cooled hollow stem pulls heat away from the head for cooler operation under high EGTs, reducing risk of tuliping and margin loss.
• Nickel‑based superalloy head material resists corrosion, creep and deformation in turbocharged, high‑temperature environments.
• Precision machining delivers OE‑like seating and concentricity for dependable compression and consistent performance.
• Built for repeated heat cycles, making it ideal for track days, spirited road use and high load motorway miles.
• Confidence upgrade for mapped cars running increased boost and backpressure.

Key features

• Genuine Supertech component engineered for the BMW 3.0 turbocharged B58 and Toyota 3.0 GR Supra applications.
• Sodium‑cooled stem for enhanced thermal control.
• High temperature nickel alloy head for longevity under extreme conditions.
• Consistent sealing and wear characteristics for long service life.

Technical specification

• Stem diameter: 0.234 in
• Overall length: 3.940 in
• Head diameter: 1.122 in

Vehicle compatibility

Direct fit for BMW and Toyota models equipped with the B58 3.0 turbo engine, including but not limited to:

• BMW 1 Series F20 F21 M140i xDrive B58 2016–2019
• BMW 2 Series F22 F23 M240i xDrive B58 2017–2020
• BMW 3 Series F30 F31 F34 340i xDrive B58 2016–2017
• BMW 3 Series G20 G21 M340i xDrive B58 2017+
• BMW 4 Series F32 F33 F36 440i xDrive B58 2016–2017
• BMW 4 Series G22 G23 M440i xDrive B58 2017+
• BMW 5 Series G30 G31 540i xDrive B58 2017–2020
• BMW 6 Series G32 640i xDrive B58 2017–2019
• BMW 7 Series G11 G12 740i xDrive B58 2016–2020
• BMW 8 Series G14 G15 G16 840i xDrive B58 2020
• BMW X3 M40i B58 2017–2020
• BMW X4 M40i B58 2018–2020
• BMW X5 xDrive40i B58 2018–2020
• BMW X6 xDrive40i B58 2019–2020
• BMW X7 xDrive40i B58 2019–2020
• BMW Z4 G29 M40i B58 2017–2020
• Toyota GR Supra A90 3.0 B58 2020

What you need for installation

The following components are required for correct fitment in B58 applications:

• Supertech Audi BMW VW 6 mm Single Valve Lock Conversion
• Supertech BMW Toyota B58 Intake Integral Valve Stem Seal

What is included

• 1 x Supertech sodium‑cooled exhaust valve

Part numbers

• TEVI-1058-HS
• Also referenced as: TEVI-1058-HS-12

Fitting and support

Professional fitting is recommended. For expert installation and B58 valvetrain advice, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Trusted by enthusiasts

We use these on our own B58 builds and our customers love the reliability. If you want dependable power and peace of mind on a tuned M340i, 540i, 440i, M140i, M240i, M440i, Z4 M40i, X3 M40i, X4 M40i, X5 40i, 840i or A90 GR Supra, this valve is the proven upgrade.

Helpful search terms

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Manufacturer: Supertech