yes, if you paid for the car without the kit and then paid to get the aerokit you technically own the standard bumpers. i reckomend keeping them because they might come in handy in the future. You could also sell them to others because i know alot of people bump their cars and damage their bumpers and look to see if anyone is selling stock bumpers so you could make some of your aero kit investment back on the original parts. I have my front and rear bumpers and side skirts kept.