Rossier YFZ450R R4 Anti Reversion Exhaust 2009-2022

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Full Rossier R4 Exhaust system for 2009-2022 YFZ450R

The header design has been tested at the AMA pro mx nationals with great results for power increase and delivery.

The anti-reversion chamber aids in exhaust gas scavenging and helps smooth out the torque curve. On the track, the quad accelerates better, and on-off throttle modulation is much improved, which gives the rider a greater measure of control.