Wow, 512whp from a 3.5l is pretty good @ 1bar considering the TS04 turbo. That's only a ~58mm turbo, and I would tend to think it would have to be something like 67mm+ to come close to 500whp @ 1bar. How high are you revving that thing Bruce?!
Sounds like a fun car!
'87 3.2 Carrera - 3.4l, Billet Design equal length headers & full bay IC, 60-1 T4 .81a/r, Kinesis Supercup replicas, Big Reds at all 4, 964 body conversion, 964 Turbo S rear spoiler