Rewards: 75 Gold, M$75,000
Location: ENDURANCE GT RACING
Unlocks from: Own the Porsche Mission R
Maximum Required PR: 101.0

There are 40 events - each of 10 tracks having 3 Trophy plus a TT, and you need to complete 2 Trophy events on a track before its TT will open, and 3 Trophy events before the next track will open up.

Progress Rewards split:
25% - 9GC and M$9,000         [PR 87.2]
50% - 15GC and M$15,000      [PR 93.1]
75% - 20GC and M$20,000      [PR 96.6]
100% - 31GC and M$31,000   

With the car at PR98.0 from winning the LTS you can obviously reach 75%, but to finish the series requires upgrade pattern 533554.  All upgrade costs are here