Aftermarket automobile engine exhaust systems comprised of pipes, collectors, mufflers and particulate traps; Emission reduction units for motors and engines, namely, catalytic converters; Engine exhaust system comprised of a particulate trap; Exhaust gas treatment systems for diesel engines; Exhaust manifold for engines; Nitrogen oxide traps for exhaust systems being parts of internal combustion engines; Particulate air filters for exhaust systems for internal combustion engines