cfin3

I have a '96 240sx with some aspec air intake on it. Its not the one that extends below the engine compartment but i was wondering where i could find one so i can get clean cold air. I have seen the injen cold air extension piece and it looks nice but pricy. Also, if anyone knows if the injen will fit ONLY on an injen intake or any intake...because it would seem they all have to be the same diameter tubing.