SuperCool Impeller Increases Water Flow. Drops Coolant Temperature By 20 Degrees. Lightweight Aluminum Casting Provide Increased Heat Dissipation. 50% Lighter Than Cast Iron. Precision Made Ball/Roller Bearings. Spin Balanced Fan Hub Sustain Higher RPMs. Great Looks - Long Term Dependability - Terrific Value. Hand Made From Premium Quality New Components. Driver Side Inlet.