I swapped out to APR coil packs and NGK-R7437-9 plugs at the recommendation of APR after going stage 1. No issues after about 8K miles.
I just did mine not too long ago, replaced with Brisk ER12S. Didn’t need a coil puller tool, just had to be careful getting them out. Warming up the engine is helpful too. Otherwise an easy job.
NGK has NEVER let me down in any of their products. I use them in my American and Japanese cars, trucks, motorcycles, lawn mowers, leaf blowers, weed heaters, and chain saws.
I've been running the 2.0t/r8 coil packs for a few years now and haven't had issues with them.
NGK actually makes the original plugs for the mk3 focus (because the engine is based on a Mazda L series) so if you're doing plugs for a focus using NGK will be just as good if not better than the "oem" brand
As long as you use the right type and gapped correctly, then you are fine. NGK, Autolite, Motorcraft, bosch, all are fine.
I have been running them for 50,000 miles with is20 then is38 setup. Work perfect.
I just ordered new spark plugs and an oil filter as well.
Gonna do brisk silver with 4C coils unless someone has any advice on Brisk Silvers being bad. Was gonna try them out over the NGK Laser Iridium
Subaru's like NGK (OEM) spark plugs and O2 sensors, respectively. They run poorly and will even throw codes if other parts are used.
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