Ignition coil DELPHI or BERU

Stepdad recommended replacing ignition coils, so I purchased a 4 pack of Delphi GN 10369 from amazon. Sure enough, we just replaced the coils, and boom, it ran good as new (to me).

I recently bought a BERU.

I have a 2017 Forte with the regular manual transmission 2L non-GDI engine. At about 19,000 miles I started getting a strange sudden drop in RPM at random times (idle or on freeway). I would mostly notice the loss in power when it dropped and it would return to normal usually in less than five seconds. Never got any codes and car ran great 99.9% of the time.

As I approached 23,000 miles it got more frequent and finally threw a P0302 (Cyl 2 Misfire). I inspected spark plugs first. To no surprise they were in great condition. I swapped cylinder 2's ignition coil to cylinder 3, cleared the codes with my scanner, and the coders all cleared. About two days later I got a P0303 (Cyl 3 Misfire).

I ordered a Delphi ignition coil (GN10877) on Rockauto to replace the suspect ignition coil. Haven't experienced the issue since. Car also idles so well now that I can't feel it in steering wheel or hear it at idle.

I had no idea how bad that ignition coil was until it was replaced and was still shocked that it started failing at 19,000 miles.

I think the only difference is lifespan and reliability. I wouldn't cheap out on plug-on-coils because the budget companies don't take as much care with the wire insulation (apparently 2 different temperature ratings are acceptable, and the cheap companies use the lower temperature), coil material, or the epoxy that coats and insulates everything isn't as good or isn't applied as well.

I went with (6 of each) Delphi GN10168 coils & NGK 2262 spark plugs. $150 with 5% discount + shipping. I hope I made a wise decision.

I personally dislike HUCO brand which it had, I replaced mine with a BERU coil, still going strong since '97.

My coil is a Beru and pretty much brand new.

Has anyone ever experienced an odd electrical type humming sound eminating from the front of the dash after putting in a new ignition coil??? I put in a Beru Coil and I could swear I now hear a faint hum that wasn't there prior to installing the new one. It kind of sounds like the radio with the sound way low when it picks up engine frequencies (but I know it's not that). It definitely sounds electrical and not mechanical and I've noticed the hum increases in frequency when I increase the rpm's. Do coils even make any noise??? Thanks.

BERU Ignition coils! ALWAYS USIN' GERMAN AUTO PARTS! Old coils out. Here's the problem - that coil on the right's connector broke off! Piece of crap!

Bought new coil. Lucky to get good German Beru unit for little over $90...last of luck. Put in new coil, still no spark.