No power gain from Underdrive Pulley?...

[Porsche9]

My UDP has been on my car for 20,000 plus miles with no ill effects. Only a little more power to the wheels and no issues at the track.

[Topless]

Wow, 273.8 RWHP sounds like a lot for any Boxster. That is about what my brother's 3.8L sleeper Cayman puts out.

Bottom line: Changing the underdrive pulley to preserve your PS pump might make sense for a track rat. Chasing a hp increase might not.