The Peugeot 205 T16 can be found in the Group B (4WD) category.
The best way to complete this is to create a Custom Career Championship with 12 Stages. With 3 Engineers apply the following Perks:
5% reduced upgrade times - Peugeot 205 T16
10% reduced upgrade times - Peugeot 205 T16
5% reduced upgrade times - French Manufactured Vehicles
10% reduced upgrade times - French Manufactured Vehicles
5% reduced upgrade times - Group B (4WD) Vehicles
10% reduced upgrade times - Group B (4WD) Vehicles
The car will be fully upgraded once you complete the Event.