Normal
Most of the JDMs comes out from the factory with factory options depending on the buyer's request. So it's difficult to know what is factory fitted or fitted by crazy jap modders. So what u see in chopshops might be modded already. RS stands for Rally Spec which is lighter in weight but u can add some options to be factory fitted such as LSDs...and etc to be used for rally or track coz u wont be needing sum of the accessories for rallying or track racing such as aircond & power windows. Oil coolers are used to cool oil either engine oil or transmission oil.