Thanks for the help guys. I will probably wait till my tank is close to empty to install the ECU so I can fill up with premium and get the full effect. Seems like there are no negatives to doing this, might as well since the previous owner threw it in for free.
As for power, on paper this car doesn't look fast, but banging through the first couple gears is always good fun. Also I think that because it is a smaller car it just feels a lot faster. The previous car I drove was a 1995 Impala SS with a stroker motor and some bolt ons. Pretty much kicked you back in your seat at just about any speed. Great fun, and I'm not going to say the protege feels anything like that, but within a few seconds I would be going fast enough to basically be thrown in jail by California law. With the protege I can ring out the car without going way too fast, and in its own way can be more fun sometimes. Two totally different cars, but each tons of fun in their own way.