Man I'm sorry for your troubles. Been away from 6speed for a while. But read to the point of "had a tune" and stopped reading. I've had my 997 turbo for 14 years now. Only mod I did was a Europipe many years ago. Tunes have always scared me. From when my car was under warranty, then extended and the ensuing years of no warranty. To me, no tuner can out think and out do the manufacturers engineers. I know there'll be all those that will say (including the tuners) that there are thousands of tuned cars out there and they are safe. But to me, they've always been ticking time bombs. Good luck as you get this sorted out.