The valve's performance is notably improved, reducing emissions and promoting cleaner air, all while maintaining the efficiency. EGR Disassembly Valve Kit Aluminum For BMW For M47N2 For M57N2 For E60/61/87/90/92/93 320 325D 330D 525D 530D 520I For X3 For X6 For X5 11717804381. The inner wall of the flow channel is smoothly polished to reduce the adhesion and accumulation of particulate matter in the exhaust gas. Solve the problem of bad fuel consumption and reduced power. EGR valve controls the amount of exhaust gas recirculated to the intake system and reduces the emission of nitrogen oxides in the exhaust gas., Manufacturer: mangchengsm