In Forza Motorsport, classic racing cars are often missing, especially older DTM, GT 1 2 3 , JGTC and more cars have not been there for a long time.
There should be more racing cars from the 90s and 2000s.
UPDATE 2024:
Years of construction are not always exact. Here are a few examples:
ALFA ROMEO 155 TI DTM '96
AUDI V8 DTM '90
BMW M3 SPORT EVOLUTION '90
BMW M3 GTR (E46) '01
BMW M3 GTR (E36) '93
#2 MOPAR DODGE VIPER COMPETITION COUPE '08
#91 TEAM ORECA DODGE VIPER GTS-R '00
FORD MUSTANG GT DTM '92
#40 ROBERTSON RACING FORD GT MK7 '09
#18 TAKATA DOME NSX '05
MERCEDES 190E EVO II DTM '92
MERCEDES AMG C KLASSE DTM '97
#12 CALSONIC SKLYINE '03
AMG-MERCEDES CLK DTM '03
OPEL OMEGA 3000 EVO 500 '90
OPEL CALIBRA V6 '96
OPEL ASTRA TOURING CAR '00
#5 OPC TEAM PHOENIX ASTRA V8 '03
#77 CUSCO SUBARU ADVAN IMPREZA '03
#6 EXXON SUPERFLO SUPRA '05