Looks like they need to do something with the exhaust pipe
6.2.6.3 Forestry approved spark arrestors or approved mufflers are required on all
vehicles. Exhaust system outlet must extend a minimum of one foot past the
rear of the occupants€™ compartment; be directed rearward out of the body
away from the occupants, fuel cells and tires; and be placed in such a manner
as to minimize the production of dust. See Section 7.9: ENVIRONMENTAL for
more information and rules related to environmental concerns and
considerations