I've driven a couple of them. A 2000 base 911 Cabriolet in Germany (that was fun) and a 2006 C4S here in Houston, which just pissed me off the second I put my foot into the accelerator...
My 2.5 boxster seemed so wimpy after that.
Best cure for feeling "horsepower challenged" is to take your boxster to a high speed DE event. Then you, like me, will quickly discover you have plenty of horsepower and not nearly enough driving experience to use what little we have in our cars.
Lord willing, I will be trading up to a CPO 991S in 3-4 years and then we won't have that pesky lack of HP any longer