Rewards: 60 Gold, R$60,000
Location: SEASON 2
Unlocks from: Owning #EDIT# Any Car In Series 
Maximum Required PR: 58.1

There are 51 events - 48 Trophy + 3 TT - with each car having a specific TT and 2-event Showcase.  Suitably upgraded any one car can reach 75%, but only the Vantage can be upgraded enough to open up the last 3 cup races (PR 51.9/54.8/58.1)

Progress Rewards split:
25% - 7GC and R$7,000      [PR 30.3 using DB9, otherwise PR 34.0]
50% - 12GC and R$12,000   [PR 35.9 using DB9 or Vanquish, PR 40.0 using Vantage only]
75% - 16GC and R$16,000   [PR 42.9]
100% - 25GC and R$25,000  

Need to spend a total 605GC to upgrade the new Vantage for series completion...upgrade costs are here .