i will call it GTT because
its RWD,have SOHC N/A or single turbo charger inline 4 or 6 and less than 300 horsepower with auto (trash)
GTR was AWD 2.6L DOHC twin turbo charger inline 6 and 274-600 horse power with manual only
GTTand GTR is use skyline platform but GTR was make for sing up the race like lancer
normal lancer = economy FF sedan
lancer gsr = is a normal lancer but came with turbo charger,racing Suspension,AWD system but it still have useless option same as the normal lancer .it call evolution ver (they use this name because this name can make alot of money after that they will use this name on the top ver of lancer like skyline GTR)
lancer rs = is racing car on pubic road(base on lancer gsr or lancer EVO but they remove all useless option+and replace with performance option,parts )