guys..just received my e36 yesterday....hope this is a right choice...few thing i noticed and need some help based on forumers experienced n knowledge, forgive me if this can consider stupid questions..hehe :1) what's the diff between S, E & M beside my gear?2) is there any problem if i remove the oBC ? coz thinking of having DVD double din in the car3) my car...after stopped and wanna start journey..after the RPM touch '2" then it change gear...is that normal? quite long woo...:stupid:4) after switch off the ignition..take out the key...i still heard something like at center area...radio...some sort like zzzzzz but not so loud...