2009 Honda CRF RS4 Exhaust

Yoshimura R&D has developed an evolutionary new exhaust system for the exciting new Honda CRF450R. The all-new Yoshimura RS-4 was designed after extensive testing and the results are profound.

 The RS-4 has a lower centralized mass coefficient to provide better handling. Additionally, an overall improvement to the big Honda's power delivery was also realized.

The RS-4 is pentagonal shaped muffler that features a carbon fiber cone end cap, two staged stepped baffle and striking good looks. The RS-4 muffler features a new front cap design that functions as a polyresonant chamber. This design makes for a quieter muffler with improved mid to top end power.

If more sound restriction is necessary, 99dB and 94dB inserts are available for AMA Pro and other racing requirements. Sound Inserts Sold Separately.