their is a huge advantage to using helical gears, but they require shimming, they are super quiet at least 50% quieter than the modify gearset...I have both and love the helicals way better. Be very patient when you start to shim them as they are harder to shim. I have the deep fire titanium piston for the helical gears....it was the best piston that jugglez carries in a half tooth design.
best of luck
Beach
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