Diesel exhaust treatement apparatus and methods

A diesel engine exhaust treatment system for treating exhaust gases from a diesel engine of a land vehicle, the diesel engine exhaust treatment system comprising first and second end portions, an exhaust gas inlet, an exhaust gas outlet, and aftertreatment components for treating a flow of diesel exhaust, the aftertreatment components comprising:

• a. At least one diesel oxidation catalyst, each said diesel oxidation catalyst comprising a diesel oxidation catalyst inlet coupled to said exhaust gas inlet and a diesel oxidation catalyst outlet;
• h. At least one diesel particulate filter, each said diesel particulate filter comprising a diesel particulate filter inlet coupled to said diesel oxidation catalyst outlet and a diesel particulate outlet;
• c. At least one diesel exhaust fluid mixing chamber, each said diesel exhaust fluid mixing chamber comprising a mixing chamber inlet coupled to each of the diesel particulate filter outlets and a mixing chamber outlet;
• d. At least one exposed selective catalytic reduction (SCR) converter, each said SCR converter comprising an SCR inlet coupled to said mixing chamber outlet and an SCR outlet;
• and
• e. At least one transfer pipe, each transfer pipe comprising a transfer pipe inlet coupled to each of said SCR outlets and a transfer pipe outlet coupled to said exhaust gas outlet,
• wherein the aftertreatment components extend in a lengthwise direction from the first end portion to the second end portion.