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The AA helix has MUCH less roller/ratcheting noise when going from load to unload on the driveline. Our roller pocket is smaller and without the EBS notch (don't worry they still have great engine braking, especially in low). This also helps extend secondary clutch roller life. Greatly increases rear wheel horsepower transfer based on our custom angle. The OEM helix angle is mild and we found some big gains without losing belt grip.
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