OK, just so you guys are clear what we have of racing cars in game (total car count without double M6, R18 is 290 I think).
Here are cars and their categories that exist in real world:
GT4
Porsche Cayman GT4 Clubsport '16
GT3
Aston Martin V12 Vantage GT3 '12
Audi R8 LMS '15
BMW M6 GT3 '16
BMW Z4 GT3 '11
Dodge Viper SRT GT3-R '15
Ferrari 458 Italia GT3 '13
Lamborghini Huracan GT3 '15
Lexus RC F GT3 '16
Lexus RC F GT3 '17
McLaren 650S GT3 '15
Mercedes AMG GT3 '16
Mercedes SLS AMG GT3 '11
Nissan GT-R GT3 '13
Renault R.S.01 GT3 '16
Toyota GR Supra Racing Concept '18
GTE
BMW M3 GT '11 (BMW M3 GT2)
Porsche 911 RSR '17
GT1
McLaren F1 GTR '95
LMP1 new
Audi R18 '16
Nissan GT-R LM NISMO '15
Porsche 919 Hybrid '16
Toyota TS050 Hybrid '16
LMP1 old
Audi R18 '11
Peugeot 908HDi '10
Toyota TS030 Hybrid '12
Group C
Jaguar XJR-9 '88
Mazda 787B '91
Sauber Mercedes C9 '89
Nissan R92CP '92
Porsche 962C '88
other LM cars
Alfa Romeo Giulia TZ2 '65 - GTA
Aston Martin DBS3 '53
Ferrari 250 GTO 62 - GTC Group3
Ferrari 330P4 '67
Ford Mark IV Race Car '67
Jaguar XJ13 '65
Shelby Cobra Daytona Coupe '64
Super Formula
Super Formula SF19 Honda/Toyota '19
Formula F1
Mercedes F1 W08 EQ Power+ '17
GT500 2016 season
Honda NSX GT500 '16
Lexus RC F GT500 '16
Nissan GT-R GT500 '16
GT500 2008 season
Honda NSX GT500 '08
Lexus SC430 GT500 '08
Nissan GT-R GT500 '08
Rally
Audi Sport Quattro S1 '87 - B class
Renault R8 Gordini '66
Not in a class
Audi TT Cup '16 - One Make with "Push to Pass"
McLaren P1 GTR '16 - One Make
Pagani Zonda R '09 - One Make
Renault Megane Trophy '11 - One Make
Subaru WRX STi IoM TT '16 - TimeAttack
And this is how PD should categorize them, then BoP would be much easier and similar to real world cars... And we do need a lot of cars to populate these classes...