Well OP just to let you know I do have the k&N got it because it look nice inside the engine bay. So far my car runs very fast I really dont feell i lost any power but I do have other bolt ons such as full exhaust.
It depends what is your intensions with your mods. I like to see the filters that is why I bought the K&N.
But what other members have said are right. But you have the right to choose whats best for you. We only provide options.
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Mine is wrapped with thermal shields.