I got Delphi and they work great
As per ignition coils, the only ones you should buy for N43/53 engines are Bosch. All the others (Delphi, Febi, HP etc.) are the same Chinese coil sold under different names, same issues as the counterfeit parts.
Delphi. I'm confident they're better than Bosch.
You can use either, but Delphi is OE.
I use Delphi on my N20 which use the same coil as N52. No problem so far.
I'm running Bosch and have been for 45k miles with no issues, even tuned running extra boost which demands more of the ignition coils.
Went back to old Bosch coil (which was not bad before) and no change.
Few months ago I got all 6 OBD1 Bosch coil packs and it changed nothing for me other than a slightly smoother top end, I still have a slight misfire at idle.
They don’t look like OE plus they have Delphi stamped on them. I’m pretty sure Delphi is not an OEM for BMW. The tarnishing looks like rust which could be explained by the use of inferior materials.
I had all new Bosch coils installed on my e46 M3 about 30k miles ago. They worked fine, until one day the car went into limp mode due to bad coil / misfire.
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