Forza 2 had entire Drifting gangs. There was drift competitions across the world with the likes of Team Orange USA, Team Washing Machine, Tokyo Drift among many others. Heres an awesome drift video.
Also many customisers, not only for tuning but for cosmetics to.
EDIT: Also thanks to full mechanical damage races, online was amazingly real. Great races where noone used each other to bump around to first place. Check it out.
EDIT: Realistic Online leagues. Here is British GT Season 2.












