The Fujita and Injen will both work. You shouldn't have to worry about throwing a CEL, especially if you relearn the ECU properly. On the 4cyl's they are interchangable.
Personally I like the Injen because you have the option of short ram or CAI. Either way, Fujita is the JDM version of Injen so you're getting the same product except Fujita's is only CAI where as Injen's can be converted.
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