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Here is a Plat and 100% all stars for dlcs listed under driveclub bikes... I have not done the dlc time trials yet but I really doubt those would pop with a save anyway. For max out all bikes trophy try getting 1 xp with a base game bike and see if pop but doubtful :( sry I had the plat completed about a month before save wizard introduced resigning. On the bright side all the star trophies should pop after doing 1 event.