[Matic Kadivec]

Thank you for a lot of interesting series  

Just a question about the GT3 series: Why only the BMW Z4, the McLaren MP412C and the Mercedes SLS ? Why not the other GT3 cars? (ks_lamborghini_huracan_gt3, ks_mclaren_650_gt3, ks_mercedes_amg_gt3, ks_nissan_gtr_gt3, ks_audi_r8_lms, ks_glickenhaus_scg003, ks_ferrari_488_gt3, ks_porsche_911_gt3_r_2016, ks_audi_r8_lms_2016)

Perhaps because these cars were used less during normal GT3 series. 
McLaren MP412C and Mercedes SLS were especially rare, since their same brand counterparts were superior. 
In my opinion the usual GT3 series became a little stale, so this is a welcome change.