congrats on your new purchase! Cheap and easy way to get more HP? There is no such thing as cheap or easy for upgrading HP in a Porsche. I have put more then $20 k into my 986 so far and have only added 65-70 HP to my 2000. I would probably suggest the least expensive mods start with a new air intake. maybe a chip tuning or if you dont mind dropping a few grand in right away get yourself a supercharger....
http://www.turboperformance.com/
Good luck with your car