Cayman 3.4 engine into Boxster S 3.2

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Getting the car to shake hands with the motor in a friendly way is doable. Getting the car to satisfy Calif smog nazis may be a lot more difficult. If you tell them about the swap it will probably never be approved by a referee cause they hate hp increases. If you don't tell and hope to fly under the radar, a DME reflash is a red flag, different exhaust manifold is a red flag, intake mods are a red flag etc. If it were mine, I would find another 3.2 with identical DME software requirements for a car I planed to keep street legal in Cali.