Nexsys Motorsport BMW N54 B58 Coil Conversion Ignition Upgrade Kit – 1M, 135i, 335i, Z4 35i – Billet Bracket + Boots, Plug & Play Harness Option – Stock/VTT Valve Cover – B58 Coils Not Included

Nexsys Motorsport N54 to B58 Coil Pack Conversion Kit for BMW E82 1M, E82 E88 135i, E90 E91 E92 E93 335i, E89 Z4 35i

End misfires and spark blow out on your tuned N54. This premium Nexsys Motorsport coil pack conversion swaps your older N54 ignition setup to the newer B58 style coils for a cleaner burn, stronger ignition energy and confidence at higher boost. Perfect for remapped street cars, hybrid turbos and track builds that demand reliable spark delivery. Designed to work with the factory N54 cam cover or the Vargas Turbo valve cover. If you run an M18 Performance cover, use the dedicated M18 version.

Note: B58 coils are not supplied. This package provides the CNC machined aluminium hold-down rail, extended boots, fasteners and your choice of wiring solution to mount and connect B58 coils neatly on the N54.

Why enthusiasts choose this conversion

• Higher coil energy for a more authoritative spark under load and at elevated boost
• Longer discharge time for improved combustion stability on performance builds
• Direct per-cylinder mounting keeps the bay tidy and removes bulky external leads
• Excellent clearance for top mount single turbo and hybrid twin setups
• Factory engine cover refits for an OEM look
• Lightweight assembly around 3.9 lb with coils installed, lighter than many alternatives

We have fitted this kit to our own shop cars and many customer vehicles with fantastic results. Feedback is consistently positive: cleaner idle, crisp throttle response and rock solid ignition at high RPM. The machining quality is spot on and the finished install looks factory fresh.

What is included

• Made in the USA billet aluminium coil rail with precision fitment
• 6 extended ignition boots for use with the OE or VTT cam cover
• All required stainless hardware
• Wiring options:
  • Plug-in adapter loom for a true drop-in hookup, USA made connectors
  • Connector and terminal set only for those building their own loom

The coil rail features tidy pass-throughs for the loom and smooth edges for a professional finish. With coils in place the assembly weighs approximately 3.9 lb.

Vehicle fitment

For BMW models equipped with the N54 engine:

• E82 1M
• E82 E88 135i
• E90 E91 E92 E93 335i
• E89 Z4 sDrive35i

Compatible with the stock BMW N54 valve cover or the Vargas Turbo valve cover. For M18 Performance valve covers please select the M18 specific kit.

Important

• B58 ignition coils are not included
• Spark plugs and coil gap should suit your power level and fuel blend

Professional fitting

Want it installed properly the first time? Book our in-house fitting service at MJ Modifications in Warwickshire. Email for a quote: info@mjmodifications.co.uk.

Compatibility check before dispatch

To make sure you receive the correct variant, we will verify compatibility before shipping. Please provide your UK registration or the last 7 digits of your VIN at checkout.

Part numbers

• NXM-ICU-N54-STVTT-RA-ST-PL-1 Raw Aluminium, Stock Valve Cover, Plug-in Harness Kit
• NXM-ICU-N54-STVTT-BL-ST-PL-1 Black Anodised, Stock Valve Cover, Plug-in Harness Kit
• NXM-ICU-N54-STVTT-RA-VT-PL Raw Aluminium, VTT Valve Cover, Plug-in Harness Kit
• NXM-ICU-N54-STVTT-BL-VT-PL Black Anodised, VTT Valve Cover, Plug-in Harness Kit
• NXM-ICU-N54-STVTT-RA-ST-CO-1 Raw Aluminium, Stock Valve Cover, Connectors and Terminals Only
• NXM-ICU-N54-STVTT-BL-ST-CO-1 Black Anodised, Stock Valve Cover, Connectors and Terminals Only
• NXM-ICU-N54-STVTT-RA-VT-CO Raw Aluminium, VTT Valve Cover, Connectors and Terminals Only
• NXM-ICU-N54-STVTT-BL-VT-CO Black Anodised, VTT Valve Cover, Connectors and Terminals Only

Made by

Nexsys Motorsport

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Photos