We do tune's and track prep for Porsche 997T's We recently did a customers car to 650bhp and it was a flying machine. Make sure you check the condition of the rads before doing any big tuning though as they are a well know failure item. Take a look at 'Falcon Performance' on facebook and under Porsche Pics there should be a few getting new rads in. I think we have done around 10-12 cars in the last year with the same issues.
A great car and I really want a gen2 one at the moment in baby blue