anyway... these features are to only that come close to hack your car, but they can be done more or less elegant

Burglar alarm - a single wire to the doorswitch that feels when doors are open

REmote engine start - 2-3 relays that are coupled on the backside og the engnition key... that that big hack.. and to remove just cut hte wires

Nightvision cam 2 for reverse cam... hardly no hack.. the cam could be mounted on a bracket

distance to car ahead warn- the same as with the cam's