Hi, congrats on becomming a Boxster owner, its lots of fun. A chip will give you a little bump in HP (about 12-15 in my case) and make the throttle more sensitive and hence the car seem much more responsive.
I will offer the advice that was given to me when I first joined the forum and got my Boxster (which I ignored) about modding any Boxster, but especially the 2.5 and 2.7L engines. If you have plenty of money to play with, and are not very concerned with getting a return on your investment, and you have realistic expectations of the outcome of performance mods (normally much less than advertised), go for it.
But realize that you can easily drop 5-10K+ on individual performance mods, and for what some (that should probably read most) floks are trying to achieve, the money would be better spent selling their base Boxster and getting a Boxster S or doing an engine transplant. Of course there are exceptions to this advice, and I may be one of them, I havnt quite figured that out yet, enjoy
Ed
Ed