So I have decided on the Injen CAI... but I have noticed that there are two different models on ebay. One is a Injen SP1305 and the other is a RS1305?? So what is the difference??? I have searched for the past two hours and i have no clue. Thank you.

 

i think one model is polished and the other is black powder coated

 

thats what i was thinking too but the rs stands for one of their line of intakes. they have IS, EIS, RD, RS, E..... but where did SP come from??