To be honest you are the first person to try that on anything newer than the 06, let alone non-turboed at that. It is my belief that the ECU would have to be reflashed to get those changes made (or in tech speak, remapped). If your tuner shop can crack it and get the maps for it and offer a custom tune I can guarantee you for the right price many HD (07 and newer) and Touring Elantra owners would be all over that (especially since the restrictions to modding that is on the car).
I say do a test run with hooking it up and trying to tune it, if not, see if they shop can pull the map and go from there (just make sure that they will be willing to insure your car if anything were to break that would hinder the car's stock performance).
Good luck with it and keep us posted, I am very interested in the progress.
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