Silence is more than just a piston head.
Right now I'm making a tuner G36, which I'm tuning to be completely silent..
Go to an RC shop, get your motor balanced, It'll use less power and have less of a whining noise. Helical gears are a must... If you have the cash, an Angel Silent Piston Head is a bloody godsend.
If not, try the Air Break..
Airbreaks greatly degrade with rapid fire... But if you're using it in semi, you should be fine.
Talk to Thundercactus, He's done this.
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