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It will give you a little performance boost (nothing huge) and a louder intake if the CAI you go with removes the hemi hat. The CAI is a good mod and works well in conjunction with other bolts ons you will probably add later down the road.
no you dont have to re-tune, but it would be a good idea to get the air out as fast as you are getting it in... so a good exhaust would be something you would have to get more sooner than later. but if you just throw on a CAI you wont throw any checks.