- Sep 22, 2015
- 5
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I've got a KN air filter in my 02 mustang 3.8. Overall, I've read really good reviews, but also that it doesn't filter as well as a regular paper filter which could damage the engine. Is this true? Also, do they ever go bad and need replaced. I just finished cleaning mine with a KN kit, need to oil it and pop back in. It's black and stiff (prior to oil). Is this normal? Thx