After you beat the first Touring Car Championship with either Oakley or Razor -- go back and you can play it again, this time as Ravenwest. It's only 4 races total (2 heats for each track).
The teammate for Ravenwest is amazing, so you shouldn't have any trouble winning first place in the championship.
It is confirmed that this works for all different disciplines.
Thanks to Barad XBA for that!