Talk:GTE-Pro: Chevrolet and Porsche/@comment-108.59.48.4-20170220141456/@comment-27945602-20170220142425

No. You have to manually unlock the tiers.

' All tiers and 83% completion can be reached without   upgrades. ' means if you have all the car in the series and if you are able to earn all trophies you would unlock all tiers in the end.