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The Akrapovič V-TUV386 is a noise damper insert for the Akrapovič Evolution Line exhaust on the 2025-2026 Yamaha YZ250F, YZ250FX and YZ450F, developed for racetracks and events that enforce a 109 dB/A sound limit.
Without it, a full Evolution Line will not clear the sound test. Motocross and off-road events test at 109 dB/A almost universally, and riders routinely discover the problem at sign-on with the bike already unloaded. The damper drops the system to the required level and comes out again for practice days.
One insert covers all three machines — Yamaha's 250 and 450 four-strokes share the exhaust architecture for the 2025 model year — so the same part serves a YZ250F, a YZ250FX cross-country bike or a YZ450F.
Fits the 2025-2026 Yamaha YZ250F, YZ250FX and YZ450F running the Akrapovič Evolution Line exhaust. Check the sound limit published by your race organisation or venue before your event.
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