I saw the show "test drive" on the speed channel where they were reviewing the new eclipse.They went to this shop and put it on the dyno for a baseline, then put intake and just a high flow axleback muffler on it and they got considerable numbers out of it.I think somewhere around 20-25 horsepower.
If I were him, I would look in to that peformance wise. But I agree with the other guys rims and lower it a little bit.