[Quicksilver]

The power you get from a chip is going to be from reducing the safety margins that the manufacture built in to deal with bad gas or from the "tune" of the engine deteriorating. The Steve Wong chip tells you their expected octane and you will need to use it. A chip isn't going to get you any serious increase in power. Much of the increase would be in driveability (Oh, and a lot of the chips are crap and don't help a thing.)
I take my car to Mexico every year so a safety margin for gas is just good sense and an aftermarket chip is out. I upgraded my car with the last chip that Porsche made for the 3.2s: #1267355358. It is the same as the ClubSport chip without raising the redline.

I had a discussion with Jerry Woods and Bruce Anderson about what you can do with the 3.2 and their answer was very clear. "There is 20 HP in the exhaust. Porsche didn't leave any power on the table in the intake or anywhere else." In other words a good set of 1-5/8" headers/heat exchangers will make you some power. Plus you can have fun selecting a muffler that will make you smile.

If you want more from the engine you will have to make changes so it pumps more air through it. That means: Turbocharge, supercharge, spin it faster, and/or increase displacement.
All of those means you either open up the motor and make changes or replace the motor.