i have my 328 supercharged
depends what kit you get, i have the AA kit...
when you send in your ECU, you have to tell them your mods, and then they will mod your ecu with that.
i had some issues, got a fuel reading and resent my ecu to them (2nd time) after this, i'm very happy with the results. you will have about 250 HP at the wheels, with a stock motor (100 HP upgrade)