i think it's to do with the manufacturer spending a lot of time and money developing it specifically for a 4 cylinder turbo engine - i was told a lot of the other available after market management caters for different types of engines so would inevitably need more time to get it to run as optimal?


a well known and widely used management was installed on one of my family's vehicles and only it's inventor was able to get the car to idle - ford spent a lot longer than 3 weeks getting it to run to it's best
PS it was still appalling to drive, even after being away for weeks to perfect it's map