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Most shops that tune the factory ECU actually use a Nistune board to create the tune, then use the Nistune software to burn the new chip they install in the factory ECU.
The Nistune daughterboard replaces the ROM chip that contains all the factory maps with one that is rewriteable in real time.
I had mine tuned this week in the Montreal area for 550$ CAD. Made a safe 288 whp on 17 psi of boost, an ISR 3871 turbo, factory internals, and 550CC injectors.
I bought the Nistune "solution" last year, and I would not buy it again. It's more geared towards the dyno shops, not towards the customers. Stick with the normal ROM chip tune, or go full standalone and replace the aging MAF based system with a much more modern MAP based one. The new Haltech Elite 750 is really interesting for smaller engines.
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