Rewards: 78 Gold, R$78,000
Location: SEASON 2
Unlocks from: Owning Any Car In Series
Maximum Required PR: 97.2

There are 51 events - 48 Trophy + 3 TT - with each car having a specific TT and 2-event Showcase.  Fully upgraded the Zonda can’t reach 75% on its own...either Huayra will, but only the Huayra R can be upgraded enough to open up the last 2 cup races (PR 95.0/97.2)

Progress Rewards split:
25% - 10GC and R$10,000   [PR 76.1 using Zonda, otherwise PR 77.8]
50% - 15GC and R$15,000   [PR 79.1 using Zonda or Huayra BC, PR 83.7 using Huayra R only]
75% - 21GC and R$21,000   [PR 86.9]
100% - 32GC and R$32,000  

When the Huayra R becomes available the upgrade costs will be:

(courtesy of Paulo, RR3 Trackside on FB)