"I also have a 2.7 engine and recently called a local independent shop to find out what can be done to give my stock engine a bit more power. I had asked about the ECU reflash with softtronics and they had mentioned it would be a waste of money on the 2.7. Stating that the 2.7 spec had maximize most of it's potential direct from the factory. And that they could do the reflash but it wouldn't make much of a change. Anyone who winded up doing it on a 2.7 chime in on this?"
I got 16 hp or so on the dyno with just the Autothority 2.7 chip for the 2000 boxster. But also got quite a bit of more low end torque and drivibility, check out my link below for a couple of dynos (with exhaust and intake).
Ed