I just picked up an OEM air dam and will be installing it in the next few days. My car has a clear bra on the front bumper. I'm thinking that it shouldn't be a problem to just install it on top of the 3M film, but would like some feedback before I start drilling. Do any of you have any experience with this? Any and all opinions welcome. Thanks.

Take the car to a shop that does 3M film and have it trimmed to go around the airdam. Then have the film applied on the airdam. The place will probably trim the bumper for free if you get the airdam done. It should cost you about $100.