For Yamaha 07-09 YZ450F or 07-13 WR450F
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100% brand new, Never been tried or installed
Made of High Quality T304 Stainless Steel Material.
All mandrel formed to ensure a guaranteed fit and performance.
More Horsepower increase on most models
TIG Welded CNC Machine Flange
Direct Bolt-On Installation, Requires NO Modification
Professional Installation is Highly Recommended (No Instruction Included)