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CLICK HERE to customize your own Yamaha
DYNO JET POWER COMMANDER APPROVED TUNING CENTER 
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CNC-ported on 5-axis machine for precise repeatability. After porting, the heads receive a SERDI® valve job to help ensure the best airflow. Airflow is improved by 47.5% over stock when flowed with Competition Intake Manifold and 42mm HSR carburetor. Heads are built with stock valve train.
Fits '99-'03 Road Star models.
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