If you are in for some racing action, then you should play Ridge Racer as it is also in 3D and is very comfortable for players to take their chance on.
Each has it's small pros and cons but all of them let you play Nintendo 3DS Roms and DivX / MKV Video that you can download from torrent sites on the new Nintendo 3DS. Please compare R4 Cards with the features of SuperCard 3DS, AceKard 3, EZ-Flash 3DS and Cyclo3DS. Many types of blank 3DS Game Cards are available on the market.
When you have the 3DS ROM files on your PC use a 3DS emulator to preview them or copy roms to a blank 3DS Cart and play these games on teh Nintendo 3D DS.
With 3DS Torrent dotCom you can download 3DS Games for free.