Im lost. For the 3.4 swap do I have to use the boxster ecu and pay expensive remappin

Or can I use the 911 ecu with no problems? I have a 1999 boxster and dont wanna pay 1500 dollars the dealer is telling me it costs to re map mine. I have heard that the 911 plus right in but i have also heard from one source that if it isnt the ecu that matches the car some security bull**************** wont let my car start, or something to that effect..

So whats the deal?


Rich