Impeller diameter increased to 132mm (OEM 125mm), flow rate upgraded to 33GPM@2500rpm. - Shaft seal adopts Freudenberg double lip structure from Germany, dustproof grade IP69K Includes M10x1.5 extension bolt kit, adaptable to 4-inch raised modification Passed SAE J2743 500-hour durability test, warranty extended to 3 years/150,000km