Upgraded Byron Bay to level 5 and did 4 laps on the Goliath course. Took just under an hour in one of the Holden's. Went up 20 levels due to the xp. Got a Horizon edition car from the wheel spins.
When do you get to upgrade Byron?
I got it to level 2 and then i moved on and i don't there was option to upgrade Byron further...