[Perfectlap]

Best mod for power is using that money to buy a faster Porsche.

To add enough power to the 3.2 so that it significantly changes the nature of the car, (like it feels like you're in a totally different car) you'll have to spend more than you (probably) paid for the car to begin with. Which is probably a 1/3 of the way towards a 996 GT3 (best Porsche bang for the buck, air-cooled or water cooled).
In fact it would be better for you to buy a 2.5 Boxster, strip out the interior, add aftermarket exhaust, lighter wheels, brakes,Optima battery, UDP,etc. then you're near Spec Boxster lap times without the Spec Boxster limitations on modifications ....at barely ~2,600 lbs. That car will fly.
In other words you should be rebuilding your 3.2 engine with an eye towards durability and not so much power unless you really step up the budget.