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.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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