Well, what happens when you drive around town is you will actually loose hp if you don't have cold air (out in front of car) going into the engine. I see alot of little street cars with what 'they' call a cold air intake (I manage a smog shop here in CA). Only problem is, its picking up the air from under the hood, and usualy near the radiator. That hot air causes hp loss.
As soon as I boxed around my K&N thats mounted directly onto my AFM, and ran ducting to it from the front grill area, I noticed the increase in hp (pickup from a stop).
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