Coil replacement... tool size?
 

I'm preparing to change the plugs/ coils on my '05 Cayenne S and would like to assure that I have all the tools necessary before I begin.

I understand that a female torx socket is needed to unbolt the coils. Anyone know what size? Also, anyone know what size 12-point (?) bit
is needed to remove the brace on the driver's side of the engine? I've seen this brace secured by a regular bolt on some cayenne, mine is
definitely a female 12-ish point bolt.

Thanks in advance!