usually to spot a gtr just look at the body shape .. if u compare a gtst to a gtr the gtr has slightly wider guards ... also, just look at the engine ... if it says 26 then its a gtr ... 25 says its a gtst ... and 20 ... then its a r32 gtst ... generally gtr is a little more than 10k over a gtst ... and inside the car ... the gtr has slightly different interior and extra gauges ... u can't really get them mixed up