Bmw e46 330ci with Alpina b3 3.3 gearbox

[usaf-br7ja]

I have fitted a Alpina auto gearbox 5hp19 on my 330ci nothing else jus gearbox and torque had to change flywheel and start motor

I just want to know has anyone done this before if so what difference did it make and did you change gearbox ecu because I haven't and it work perfectly

I have not driven the car properly yet due to no time

Let me thanks