Not To bash you or anything.But heat range has everything to do with how a car's engine performs.
A spark plug is made up of ceramics, steels and nickel alloys. These materials do not have the ability to produce energy or heat. When we talk about the heat range of a spark plug, we're referring to its ability to move heat away from its tip or core nose into the cooling system. A cold spark plug would have a cooler tip temperature than a hot one. With fuels today, we know that anytime the tip of the ceramic core nose goes below 850 F, carbon will build up and the spark plug will foul. We also know that if the tip temperature of the plug exceeds 1550', the metals will begin to break down. At approximately 1700, the plug will glow and can become a source of pre-ignition within the combustion chamber. It's clear that maximum performance can be achieved with a spark plug that has a temperature of greater than 850 at idle, but no more than 1550' under wide open throttle.
So heat range has everything to do with that.Most of these cars are very forgiving,some people run plugs 1 heat range colder to compensate for the tune they have.I've seen many s4 running stock coils and different heat range plugs without any issues and produce great power without the need to upgrade the coils.Unless of course your building a monster truck engine for your s4 and need 2000hp then I can understand the need for the upgraded coils.
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