Hi, I've got BMW E61 2008 auto with N53 engine. As fare as i know, this engine is very similar to N54. It will be almost Plug&Play. I've checked that I've got gearbox GA6HP19Z and 335i also uses that gearbox, but than i find out that gearbox is in few diffrent setups which can cover 230, 320 or 400 nM of torque. Can anyone tell me is that true? Or maybe its about different toruqe converters? The reason I'm asking is i would like to stay for now with my current gearbox if possible. Sorry for bad English