Not saying any of you are dumb but...

I dont understand what the fascination with K and N is. People think they are going to gain like 10hp. It's stupid the only way you are going to gain that is if your filter is completely full of shit. Then you will gain 10hp but it wont be 10hp over stock, it will be 10 over your numbers you made with your shitty filter. Its an air filter, cmon.

For most cars I would say an intake, except for a wrx. There may be others that dont like intakes as well. Also intakes give you a nice sound if you have a turbo.