boss ya remon basha,
from my personal experience, the most important thing in the plugs is choosing the right heat range and the right gap for your car.
you can know this from your user manual, if you don't have one get it from the first plug you have changed.
ya3ny law gept ay poge adeem we 2arait elly maktoob 3alayh we kan bosch masalan momken awy ngeep badeelo men el anouar el tanya zay NGK we za splitfire.
from a personal experience split fire makes more power and NGK iridium makes smooth running and slightly more power and also have very long life.
also i tried before Bosch 3 sham3a we 4 sham3a mesh tamam awy ya3ny.
hope that helped. ana ba2a mashy 3al Iredium tamam we mesh nawy aghayar tany.
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