The C simply is part of the model name. It is a 300C with a Hemi. The C is also seen in the 300C Touring edition and the base level 300C. Chrysler also makes a model by the name of 300M.
wrench size 10mm and if your battery died and you cant open the trunk, you have to enter the trunk through the back seat and pull the safety nop to the left.there is a positive anode under the hood...