Impeller adopts 17-4PH stainless steel laser welding process (dynamic balance class G2.5) Shaft seal upgraded with Japanese NOK double lip seal (IP69K protection class) Pre-assembled with ARP 8740 chrome molybdenum steel bolts (shear strength >180ksi) Adapted OE No.: 52088401AF, passed the 1000-hour bench test of SAE J2743