i have no clue man. i figured i'd need a working map sensor. but my friend (the one gonna sell it to me) said it basically replaces the signal getting sent to the stock ecm and that reguardless of if my map sensor works correctly or not the fcd will tell the ecu i have "perfect" perfect pressure according to what the ecu thinks i should have. something along those lines, but i don't know thats why i'm asking for input lol but i'm gonna tell him that if it doesn't work i want my money back either way lol