Go to "GRID Online", then "Events", then "Xbox LIVE", and select "Online Playlist" and choose the "Alternative" playlist. In this playlist you will find a variety of events such as Touge, Face-Off & Drift events. You want to enter into either a Touge or Face-Off event as you will only be competing with one other player, normally someone a similar level to you. You have a better chance at winning this way, so you should get it eventually. Also, keep in mind that you can upgrade your car a little if you need it.