i have a rt and i have a k&n induction kit for it.do the induction kits make any difference on my engine?iv had the airfilter on for a year now and its started to make a really anoying hissing noise when i put my foot down.I know that its sucking in the air which is probably the noise im hearing but its a f**king loud hissing noise that it never use to do.what could it be?and will putting my airbox back on make my car slower?(im also taking it off becuase my car tanks to much petrol)