Upgrade of E53 2004 4.4 to 4.8IS project

[eyeiieye]

Originally Posted by TerminatorX5

no, not much of explanation, other than the obvious descriptions... which options are missing?

4.4 (missing)
S248A LENKRADHEIZUNG Steering wheel heater
S302A ALARMANLAGE Alarm system (interior mirror doesn't have red bulb like 4.8IS, how to confirm the option)
S494A SITZHEIZUNG FUER FAHRER/BEIFAHRER Seat heating driver/passenger
S502A SCHEINWERFER-WASCHANLAGE Headlight cleaning system
S785A WEISSE BLINKLEUCHTEN White direction indicator lights

4.8IS
S840A HOCHGESCHWINDIGKEITSABSTIMMUNG High speed synchronisation (what does it mean?)

for both , what S818A BATTERIEHAUPTSCHALTER Battery master switch

based on configuration of both cars, which items recommended for the swap
thanks