Eldor Ignition Coils & Bosch Spark Plugs Tune-Up Kit — BMW N55

Eldor is a genuine BMW OEM supplier, meaning these coils aren't reverse-engineered aftermarket copies — they're produced by the same manufacturer BMW sources from, built to the updated design specification that BMW revised specifically to correct weaknesses in the original coil generation. Alongside them, the Bosch ZR-5-TPP-33 plugs are a high-power variant featuring a fine-wire iridium electrode that maintains a consistent, strong spark under boost, resists fouling, and holds up across extended service intervals — exactly what the N55's forced-induction demands require.

Fitment covers the full breadth of N55-equipped models from 2010 through 2019, including the 135i, 135is, 335i, 435i, 535i, 535i GT, 640i, 740i, M235i, X1, X3, X4, X5, and X6 in their various xDrive, sDrive, and Gran Coupe configurations — as well as ActiveHybrid 3, 5, and 7 variants. If your BMW runs an N55, this kit almost certainly fits.

To make the job as straightforward as possible, a free magnetic 14mm swivel socket is included in the kit. The swivel design is a genuine help on the N55, where limited clearance around the plug wells makes a rigid socket awkward to use. Everything you need for a complete ignition service arrives in one box, with no separate tool runs required.