An underdrive pulley will get you 5-10 hp and Tq for around $200. It is NJ smog Nazi friendly (headers and chip probably won't pass NJ smog inspection), It will not burn down your car (as several here have after adding headers). It is not a cool shiny bling item you can show off at cars and coffee... it just works. Or you could drop in a Raby 3.6L but you might need a little more than $2k.
Good luck with your mods and enjoy your car. Don't forget to get her to a track and ring her out a bit.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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