Paired this with Boyesen Power reeds and that is the best thing I ever put on my '03 Yz85. It made it a little more ridable but never restricted power through the mid and top.
Boyesen Power Wing
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Here is the listed benefits of the product:
-NCREASED AIRFLOW PERFORMANCE
-Increases horsepower and torque in 2 and 4 stroke bikes
-AERODYNAMIC design maximizes velocity generation and power gain
-WING CHANNEL minimizes disturbance at needle jet without affecting jetting curve