Okay, so I've been playing the Moto GP demo non-stop since I got the beta pack two weeks before launch. I finally found a used retail copy in GameStop. So now I can build my custom bike and stuff ... but I noticed that the retail version of the game only has splitscreen and system link support. So do I just build my custom bike in the retail game and then swap discs for the online demo to use my custom bike online? I'm kinda in a hurry to figure this out since GS has a 3-day return (for cash) policy.