Dont buy a CAI if it doesn't require a tune.
When your purchase a tuner you will choose the tunes your want and they will come preloaded in the tuner... then its simply plug 'n' play.
There are many different tunes out there. ie. 87 Octane Economy Tune, 91, 93, etc.. So you CAN use different octanes with whatever tune you choose. But, for example, dont ever load a 93 race tune on and put 87 octane in it. If you come to a place and you must get gas and they dont sell the octane you need you can always (if you have your tuner on you) reflash the tune to something else they do have.
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