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BMW N55 & S55 B58 Ignition Coil Upgrade Kit

Upgrade BMW N55 and S55 ignition performance with a B58 coil-on-plug conversion kit built around USA-made billet aluminum brackets, longer coil boots, and an optional plug-and-play harness.

Important: B58 ignition coils are not included. This kit supplies the conversion hardware; you provide six compatible B58 coils.

Why upgrade?

• B58 coils are reported by Nexsys to produce 2.3x the energy output of stock N55/S55 coils.
• Longer spark duration than the Precision Raceworks N55 coil setup.
• Coil-on-plug layout removes the need for extra spark plug wires.
• Uses the stock coil mounting area for strong clearance around top-mount turbo setups.
• Stock engine cover fits with this kit.

Included

• 3 USA-made billet aluminum coil brackets
• 6 longer ignition coil boots
• Plug-and-play connector harness made and assembled in the USA when that variant is selected

BMW fitment

Draft fitment generated from Kies Vehicle Fitment Database v2.xlsx. Scope: US-market BMW vehicles with N55 or S55 engine-family data. Mixed N55/B58 rows should be confirmed by engine before purchase.

Before ordering

• Fits BMW N55 and S55 engines, including early E-series N55 cars.
• B58 coils are sold separately. Nexsys lists compatible OE part numbers 12138643360, 12138678438, 12138647463, and 12137619385.
• Confirm your engine code if your model year overlaps a mixed N55/B58 chassis row.

FAQ

Does this kit include B58 ignition coils?
No. The kit does not include B58 coils.

Does it fit early E-series N55 cars?
Yes. Nexsys states the kit fits all N55 and S55 engines, including early E-series cars.

Which variant should I choose?
Choose Plug and Play for the complete connector harness. Choose Connectors and Terminals if you plan to assemble or integrate the wiring yourself.