Leave the airbox alone unless ur changing the plenum to something Richard sells. Unless you weigh 400 lbs. the 135 lb son isn't running you down on the '06. You might think about getting the ECU reflashed. They really detuned the Gen II, yep I know it runs like nobodies business.thx guys, my oldest son inherited my 06 LE, Im hopeing he cant run me down lol. should I change air box or leave stock?