Denso is what I run and never a problem.
I replaced the spark plugs over the weekend, and I’m doing the ignition coils tomorrow replacing them with brand new Delphi’s.
I changed my ignition coils to delphi aftermarket ones and the idle is nice and smooth now. But the old ones had like 200k km on them.
That's the Delphi coil. It's the updated part from the original all black Bosch. It's the only one I put in my customer's cars.
Delphi is considered the go-to for N52 coils.
My delphi has been running good for about 20k miles with ngk wires and plugs.
Truly you can’t get anything but the Denso coils. There’s no money buying and installing twice.
Replaced with Delphi coils and it hardly bucks, still does but not as bad as oem once in a blue moon for a half a sec.
I don’t like the Delphi ones cause they come apart, if you do spark plugs again say 20k miles passes you could deal with the silicone tube on the end getting stuck down when pulling them, then you gotta be careful and get the spring and that out without the spring flying off somewhere.
The auto shop found out what the problem was as they had replaced two of the ignition coils with OEM and two from a company that produced the ignition coils for Mazda. The two from the company (Delphi) went bad. I have to use only parts from Mazda.
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If choosing ignition coil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare ignition coil across these categories:
In March 2026 on PartReview, ignition coil Denso were overall better than DELPHI.
In March 2026 on PartReview, ignition coil Denso were overall more popular than DELPHI.
By vote balance, ignition coil Denso surpassed DELPHI:
By number of reviews, ignition coil Denso surpassed DELPHI:
In March 2026, according to PartReview, ignition coil Denso led more car-specific ratings than DELPHI:
Denso are chosen by owners of cars such as: Honda Fit, Volkswagen Passat, and others.
Ignition coil DELPHI have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of ignition coil DELPHI with: Bosch, MSD, NGK, APR, HITACHI, OEM Volkswagen, BERU, Bremi, Duralast, OEM Audi.
Also available: comparisons of ignition coil Denso with: Bosch, MSD, NGK, APR, HITACHI, OEM Volkswagen, BERU, Bremi, Duralast, OEM Audi.
You can also see who is better among other ignition coil manufacturers: Bosch or Denso, Bosch or DELPHI, Bosch or MSD, Bosch or NGK, Bosch or APR.
