Rating Car Class Gem Upgrade? Cost Maxed Rating BMW M3 GT2 R Yes $20 Maxed Rating Mazda Furai R Yes $20 Maxed Rating RWB Stella 930 R No $20 Maxed Rating Nissan GTR Nismo GT3 R No $20 1668 Rating SRT Viper GTS R R No $15 1668 Rating Scion FR-S R-SPEC R Yes $15 1668 Rating BMW Z4 GT3 R Yes $17 1668 Rating McLaren MP4-12C S…