impact on HP is roughly 15, but variant on temperature and speed (in theory, the car moving would suck in colder air than car that is stationary on a dyno). Regardless, you will notice a difference.
Negative effects: K&N filters must be kept oiled. Over time, the oil dries up and they need to be reoiled. It's not hard, but if neglected its filtering abilities are reduced and you run the risk of using unclean air.
I'm not sure, the AA is around 300.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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