A structure for the front section of a vehicle body, allowing a collision load to be efficiently transmitted from upper members to front pillars. The trialing assembly includes a broaching plate having a tibia engaging bottom surface adapted for placement atop a tibia and an opposite top surface, the bottom and top surfaces extending between an anterior edge and a posterior edge of the broaching plate. The muffler includes perforated plates and baffle plates in its interior space. The authentication memory 332 can be accessed only by external devices which have been affirmatively authenticated.