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.
I've been running the NGK since I'm pretty sure they are the OE manufacturer. Subaru is charging crack prices for those coils.
My delphi has been running good for about 20k miles with ngk wires and plugs.
I installed ngk coils originally and they lasted the longest ( around 8k miles before the first one went ).
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.
NGKs product quality has diminished but a brand new set of 6 in and 2 of the six aren't working after about 2 months
Write your review
Help others - share your experience with this part.
Voted AGAINST engine oil RAVENOL on the rating page
The brake pads OEM Alfa Romeo got the first review!
The brake caliper OEM BMW got the first review!
The brake pads OEM Infiniti got the first review!
For wiper blades PIAA already 100 reviews.
For battery Energizer already 25 reviews.
In the rating best water pump already 12 brands participate!
In the rating best timing belt already 13 brands participate!
In the rating best head gasket already 3 brands participate!
In the auto rating oil filter for Volkswagen Passat already 5 brands participate!
In the auto rating brake pads for Mazda 5 already 10 brands participate!
In the auto rating tires for Subaru Outback already 50 brands participate!
For cabin filter Fram already 25 reviews.
Voted AGAINST engine oil RED LINE on the rating page
Voted AGAINST engine oil PENNZOIL on the rating page
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 DELPHI were overall better than NGK.
In March 2026 on PartReview, ignition coil DELPHI were overall more popular than NGK.
By vote balance, ignition coil DELPHI surpassed NGK:
By number of reviews, ignition coil DELPHI surpassed NGK:
In March 2026, according to PartReview, ignition coil NGK led more car-specific ratings than DELPHI:
NGK are chosen by owners of cars such as: Honda Civic, 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, Denso, MSD, APR, HITACHI, OEM Volkswagen, BERU, Bremi, Duralast, OEM Audi.
Also available: comparisons of ignition coil NGK with: Bosch, Denso, MSD, 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.
