ok i just bought the cold air intake from americanmuscle.com ( mustangtuning.com), the one thats 74.99. so i put it in my car and im thinking im ganna get a lill more of a beefed up sound out of it. i turn the car on and i get annoying hissing sound coming from the air filter. is this sound normal? and another problem im having with it is when im in drive and fully stoped my rpm's rev slightly up and down. im thinking about returning this one and get the K&N setup. what should i do?
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