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.
You can get the champion version of the RS7 plugs for less than $20 a plug and they’re working great on my car!
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.
They're both fine brands, I doubt you'll notice a difference. NGK is most likely OEM for your Civic, but it's not like Bosch is bad, they're OEM in my BMW.
I had EPC light/limp mode and P303 as well about a month ago on my '12 GLI (APR Stage 1+) at 102K miles that recently had a walnut blast and new Denso plugs at around 101K miles. Swapped coil packs as well and still P303 with EPC light/limp mode.
My 6.0 never ran right unless I used AC Delco. And specifically whatever the current equivalent part number is to what the manual says.
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