Supertech BMW N55/S55 Black Nitrided Stainless Steel Intake Valve 32mm (M135i, 335i, 435i, 535i, 640i, 740i, M2 Competition, M3, M4) - BMIVN-1055S

Supertech BMIVN-1055S Inlet Valve for BMW N55 and S55

Looking to refresh the valve gear on your turbo straight six or preparing a robust head build for track days and hard road use? This Supertech hardened black nitrided stainless inlet valve delivers dependable sealing, low friction operation and outstanding heat resistance in boosted BMW applications. Ideal for tuned cars, remapped setups and performance engine rebuilds, it offers OE style fitment with proven durability where it matters most.

We have fitted these on customer cars and our own shop projects at MJ Modifications and the feedback has been consistently positive on reliability, wear characteristics and smooth running at high rpm. If you are replacing tired originals during a cylinder head refresh or assembling a performance valvetrain, this is the quality choice.

• Precisely machined 32 mm head for stable airflow and dependable seat contact under boost
• Black nitrided stainless construction for excellent scuff resistance and longevity in high temperature environments
• Direct fit for BMW N55 and S55 straight six engines across popular F series platforms
• OE-like dimensions for easy installation and consistent clearances
• Sold individually so you can order the exact quantity required

Why enthusiasts choose this inlet valve

The nitrided surface treatment increases surface hardness and fatigue strength, helping the valve cope with the thermal load and cylinder pressures typical of forced induction BMW builds. Expect clean sealing, stable performance at high rpm and reduced friction for a long service life. Perfect for fast road, club sport and track day BMWs that demand reliability as power increases.

Technical details

Part number	BMIVN-1055S
Material	Black nitrided stainless steel
Head diameter	32.00 mm
Stem diameter	4.97 mm
Overall length	104.9 mm
Sold	Individually
Manufacturer	Supertech

Vehicle applications

For BMW 3.0 petrol turbo models running the N55B30 or S55B30 engines, including:

• 1 Series F20 F21 - M135i, xDrive variants
• 2 Series F22 - M235i, xDrive variants
• 3 Series F30 F31 F34 - 335i, xDrive and Hybrid 3
• 4 Series F32 F33 F36 Gran Coupe - 435i, xDrive
• 5 Series F07 GT F10 F11 - 535i, xDrive and Hybrid 5
• 6 Series F06 Gran Coupe F12 F13 - 640i, xDrive
• 7 Series F01 F02 - 740i, 740Li and xDrive
• M models F87 M2 Competition - S55, F80 M3 - S55, F82 F83 M4 - S55 including GTS and CS
• X models F25 X3 35i, F26 X4 35i and X4 M40i, F15 X5 35i, F16 X6 35i

If you would like us to confirm compatibility by VIN, contact our team and we will be happy to help.

What is included

• 1 x Supertech black nitrided stainless inlet valve

Note: Sold individually. Please order the correct quantity for your cylinder head.

Professional fitting and support

For installation, machining advice or a complete head build, choose MJ Modifications in Warwickshire. We offer in-house fitting for BMW straight six performance engines. Request a quote at info@mjmodifications.co.uk.

Part number

BMIVN-1055S

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