Why would anyone want a stage 3 map? You have StreetTuner, utec ecutek!!!???? At stage 3 there are so many variables, why wouldn't you get a custom tune to make it worthwhile and safe. Every car is different, and should be tuned accordingly.
A stage 3 off the shelf map might be comparable to a properly tuned stage 2.5.
Makes no sense to me. Do it right if you're going to mess with big turbos and more fuel, etc. Custom tune!