Ignition coil DELPHI or OEM Volkswagen

There are a lot of parts you can trust aftermarket, but electronics are usually better OEM. Denso and Delphi make a lot of OEM Subaru parts. In this case, I believe Delphi is the OEM manufacturer for coil packs, I would try them.

Delphi. BMW started with Bosch and after misfire issues they switched to Delphi (I think in 2011?). Go with Delphi, my old e82 with an n52 had tons of misfires at 40k with Bosch coils and the Delphi’s had no issues.

I had issues with misfires until I replaced the coils with genuine oem. Before that I had all new Delphi 10571 which were not the same and ultimately fixed my misfire issues.

I won't install anything but the Delphi coils.

Don’t get Bosch coils or plugs. Get Delphi coils, they’re the updated design. As for plugs go with NGK

I’ve used both. Didn’t notice any difference. Have Delphi’s right now. Both work great for light and mid tuned setups.

The F revision was current as of April 2015 when I replaced all of the factory coil packs that were installed in my 07 2.5 Jetta. I had one go bad and decided to just replace all of them and the plugs while I had it all opened up.

Ok, So today I cleaned all the grounds then checked them with a multimeter, put new plugs in, changed the ignition coil, and still won't start. It has good spark now, and it's definitely getting fuel.

I had troubles with Delphi units. Replaced all 6, then replaced them again with a wty set. Still had issues.

Delphi quality has drastically dropped over the past 2 years. We’ve gotten multiple DOA units, and ones that fail within 6 months.