Lots of different ideas on this. I looked into engine mods a few years ago as I used to hot rod a lot of Fords, Chevys, Hondas, and Nissans. With very few exceptions I found engine mods on a 2.5L to be just a big black hole for Benjamins. Very little performance return/dollar spent.
FWIW every Boxster class track record on the West Coast was done in a car with a stock motor. No turbos, no chips, no plenums, no nothin. They did their mods on suspension, weight loss and tires. This is where I am doing my R&D.
Ultimately it is your car and your dough. Do whatever you think will make your car what you want it to be.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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