Yep that's right, it's a piggy-back that ~2 places in the country can tune.
Just get the ROM remapped, it's more than sufficient for any car and can handle the biggest of changes with simple retune ie, injectors, AFM, turbo swaps, fuel pumps etc et.....I'm on about 230rwkw and my car idles/shifts/drives like stock (but faster) the ROM cost me $200 and I hired a dyno a tuned the car myself for $300