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NOTE: Image is for reference only, actual product may vary slightly depending on your specific application. Quadboss High-Performance CDI Box for Yamaha YFM660 Grizzly 4x4 2004-2008 Product Details When standard revs won't cut it. Unleash the power. These CDI Boxes are designed to enhance overall 4-wheeler performance. Includes duplication circuits for maximum reliability, increased RPM redline and altered ignition advance curves. Comes with altered advance curves to increase performance through...

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