TZ Blue is right, your OBDII engine software can handle the CAI without the Dinan software download, but then why should it have to. Your engine will adjust itself to handle the extra air, but it will not give you the performance lift you bought the CAI for, only the software download can do that.
So if you are just wanting to get it for the looks and bragging rights, don't get the software, but if you want the mod to do what it was designed to, get the software. You will not regret it!! :thumbup: