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.
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've seen with a digital tachometer a 1,000rpm difference between a laser brand spark plug and the oem ngk spark plug in a chainsaw. So for me it's what the oem uses is what I put back in.
Went through both ngk and autolite, didnt like they're spec'd plug for it.
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