Anti-pollution devices for motors and engines; Catalytic converter units for vehicle exhausts; Engine exhaust system comprised of a particulate trap; Engine exhaust systems comprised of pipes, collector and muffler; Enhancement parts for internal combustion engines, namely, fuel catalysts; Exhaust gas treatment systems for diesel engines; Marine engines and parts and fittings thereof; Mounting brackets adapted for exhaust systems for internal combustion engines; Mounting fasteners adapted for exhaust systems for internal combustion engines; Mounting hangers adapted for exhaust systems for internal combustion engines; Nitrogen oxide traps for exhaust systems being parts of internal combustion engines; Particulate air filters for exhaust systems for internal combustion engines; Silencers as part of vehicle exhaust systems