Boyesen Power Reed Dualstage Yamaha 4 Tops 4 Bottoms Includes Metal Plates Moto 7.5 Smooth Roll-Off System operation

Smooth Roll-Off System operation

525 EXC-F 10-11

MX 250 19-21

Matthieu Ternynck and many others demonstrated the quality and performance of Doma Racing exhausts

Boyesen Power Reed Dualstage Yamaha 4 Tops 4 Bottoms Includes Metal Plates Moto 7.5 Smooth Roll-Off System operationOne reed petal is NOT enough! Boyesen's revolutionary dual stage reed design delivers more usable power than stock. Stock single stage reeds operate most effectively within a relatively narrow RPM range and are limited because of the single stage design. Boyesen's one soft reed on top of one firm flow through reed gives you a wide range of intake control, plus increased intake velocity. Your original reeds can't possibly duplicate that performance.