Athena P400485100016 478cc Big Bore Cylinder Kit (98mm Bore) - Forged Piston Performance Upgrade, Converts 450cc to 478cc, Compatible with Yamaha YFZ450 ATV, YZ450F, and WR450F Tire Prep The 2-piece manifold design provides

The 2-piece manifold design provides the clearance needed for Ford chassis installations

it features a thin jaw profile that lets you get into smaller areas and allows measuring wires in bundles and panels

engineered to shield your equipment from harsh weather

for the 2003-2009 4th Gen 4Runner

Its design ensures precise handling and superior cornering control

Athena P400485100016 478cc Big Bore Cylinder Kit (98mm Bore) - Forged Piston Performance Upgrade, Converts 450cc to 478cc, Compatible with Yamaha YFZ450 ATV, YZ450F, and WR450F Tire Prep The 2-piece manifold design providesUPGRADE YOUR RIDE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low end torque, and unmatched acceleration from your 450cc four stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400485100016), a premium race proven package engineered in Italy to seamlessly convert your factory setup into a high revving, high output 478cc powerhouse. Entirely cast from high grade aluminum and treated with a specialized Motor Nicksil