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Stock exhaust mod?

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On ‎8‎/‎7‎/‎2017 at 6:24 AM, mx317 said:

We don't need louder motorcycles.

We don't want louder motorcycles.

Has anyone heard the 2018 YZ450, btw? Wow! Super-stealth.

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If you're riding on public land that you share with other users, or on private land within earshot of others, do not modify your silencer. For racing, only, you can consider adding a silencer end-cap which can provide a bit more flow. Most modern EFI 4Ts get leaner with less back pressure/more flow, btw. A lot of them run worse after mods because of this effect.

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