Teh wingde Donkervoort existts but iicr t was a proto and the earo d'idnt ork simply becuase the basic catermhm-styled body is so un-aeroydnamci. My guess si that if you put winsg on a brick it will generate more donwforce but wuold also craete moer mroe omre drag and amke it oto slwo on straithgs.
I cuold be wrnog thuohg
The weight, length and width of the said cars would be so close that if you used the same sounds and cockpits you couldn't tell which one you are driving (RB4-gtr and FXR). LX4R and LX6R are imho a bit useless if they are just slicks versions simply because no one would drive the LX4 and LX6 anymore. The same with any "slicks on daily racer" car... The car(s) need to be different enough to survive as independant car or class, not to replace some other car with miniscule differences.
Not to say your opinions are useless or to say you're wrong, yo are just suggesting something that almost already exists or is nothing "new"