K&N cold air intake system for my car?

Hi, I have a 2003 Jetta and would like to increase the horsepower just a bit. Nothing to dramatic..10 horses would do the trick. I was thinking of getting a K&N cold air intake system. Could someone please tell me what the pros and cons of doing this would be? It says they guarantee a power increase. Also, about... show more Hi, I have a 2003 Jetta and would like to increase the horsepower just a bit. Nothing to dramatic..10 horses would do the trick. I was thinking of getting a K&N cold air intake system. Could someone please tell me what the pros and cons of doing this would be? It says they guarantee a power increase. Also, about how much would it cost to have one installed? I'll vote best answer :)

Also, what are some other ways I could increase horsepower a bit.
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