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.
I just did the change myself on my Gen 1 Mazda 3. It's simple! I used NGK Laser Iridiums.
The NGK's worked beautifuly.
I used NGK, 6 month no issues.
I changed spark plugs to NGK laser platinum plugs with a 0.32 gap. The issue only arouse after I got the tune.
Went through both ngk and autolite, didnt like they're spec'd plug for it.
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