Board Thread:Game Discussion/@comment-122.167.36.10-20160927084024/@comment-29288956-20160928155520

Yep, the cars cost X and the upgrades cost 4X. The cost of the level 4 Engine upgrade for the tdf is 130 Gold and I bought my Ariel Atom for 120 Gold! Also the last engine for the MP4 is ridiculously expensive at 80 Gold.