No need to drink yourself into a Dr. Pepper coma to get the promotional Mass Effect 2 DLC. Hellforge has discovered that the promo codes provided at purchase are completely reusable... you can get this DLC with no purchase necessary.
Here are your codes, as originally provided by Hellforge:
Your next step is heading over to the Dr. Pepper promo Web site and doing a little work of your own. Simply sign up for an account using fake details (it won't confirm your info), login, and then enter one of the codes. The site will then re-direct you to an EA account page, where you can sign in and choose your Mass Effect DLC.
You can do this three times to receive the goods -- the Umbra Visor, the Recon Hood, and the Sentry Interface. Oh, and you might want to at least consider going out and buying a Dr. Pepper or something. From what I understand Diet Dr. Pepper tastes a lot like regular Dr. Pepper.
Mass Effect 2: Free Dr. Pepper Promo DLC Codes [Hellforge]