I really want to put a CAI on my RT for the looks and go ahead and tune it for 91 octane ( I use 93 anyway ). The problem is my wife drives the car as a daily driver and she aint going to let me make the exaust loud. Can I do the CAI and tune without an exaust? I also need to make sure the CEL won't be on with the mods especailly with the extra back pressure of the stock auto exaust. Thanks for any help and by the way R squareing the wife isn't an option.