These are trim levels. They just mean they have better options or engine. For example, the Acura Integra has an RS, LS, SE, GS, GS-R and Type-R. As you can see, they might have something like leather, 6 speed and so forth.. this is my writing for an integra since im an integra fanatic:RS- Base model, "type-r" shell because of the lightweight and "stripped" model.LS- Luxury SportMost preferred, has a little luxury stuff like power everything, cruise control and bla bla.SE- special editionHas leather and a rear spoiler, but they turned it into a GS.GS- Same as an SE.GS-R: DOHC VTEC B18C1 motor, 8000rpm redline and "fully loaded"type-r: type-racing, has a B18C5 DOHC VTEC motor and redlines at 8200rpm. rare!And these four integras all have the B18B1, non-VTEC motor at 7000RPM. Oh, and these come with an automatic, or a stick.