Board Thread:Questions and Answers/@comment-122.180.251.92-20151015164711/@comment-25051390-20151127145635

Car Mastery took a serious nerf from when it was first introduced in Hot Summer Update. Many free upgrades were reduced or removed, and several credit rewards were also reduced, both from repeatable races, and apparently also from first-time rewards. Even the boosters that were offered by the Camaro Z/28 and Datsun 280Z were reduced (especially the Extra Tanks). Still, I salvaged what I could.

The nerf was unfortunate, as it ultimately sealed my decision on whether to buy the Ferrari 330 P4 when it was discounted. With two potential Class A upgrades removed, I did not purchase it.