Well the tuning software I have seen is dimsport. It starts off way North of 2500. You should be able to get a remote tuning cable for this. Custom remote dyno tunes are pretty normal these days. Where are you located? Give Eurocharged a call. They have fair prices for the base tunes and do custom tuning by the hour. It can be done over the internet.

What transmission setup are you planning on using? The stock transmission in a 97 can only handle about another 100hp but you will have to increase the pressures to get it to hold. It can be built to handle more fairly easily though. I plan on having the PCS standalone tcu on the can bus in the next few months. I am doing the later model transmission control units 1st but have a bit of the info for the older stuff already. My plan is to have the egs51 and 52 plug and play in the factory environment for Mercedes, Chrysler, Porsche, and Jaguar.