[thstone]

1) Some HID kits can cause electrical issues. Solving the problem can be time consuming. The cause is usually low voltage to the HID ballast but the fix can be hit or miss. This problem is more of a PITA than anything else.

2) ??? Do you have any more info that you can share? what kind of banging? Any certain area of the engine?

3) Momentary blue/white smoke on cold start is normal. Should dissipate in a few seconds. Big clouds of white/grey smoke (like a smoke screen) is a failed AOS.