Make sure when you replace these you use too quality plugs from a reliable parts store, too many stories of bad fakes or lower quality products from online sources. Coils are also likely a good idea at this point, again go with Bosch, again from a reliable source.
Ive had zero problems with Hitachi coils.
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.
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.
I have Bosch in my 2015 currently with no issues for 30k miles so far
I’ve ran Bosche in all my M3’s with great success.
I’ve used Bosch without issue as well.
I bought a new Bosch coil from TT because the original in my '88 Scirocco 16V didn't have the exact readings the Bentley said it should have. The new coil didn't have the correct readings either according to the Bentley and it didn't make my Scirocco run better.
Went back to old Bosch coil (which was not bad before) and no change.
Replaced the plugs and coils with Hitachis from Rock Auto for about $40 a piece. The Hitachis turned out to be dog \ud83d\udca9 and every one blew within about a year (the first one went bad in about a month).
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