Yoshimura

The work that went into developing the RS-4 muffler has paid big dividends in Off-road Racing; winning multiple Supercross and Motocross titles since it's inception. We’ve developed the current...

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year,...

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year,...

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year,...

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...

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...

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. ...

This Yoshimura RS-4 exhaust system was designed with one thing in mind, winning races! The RS-4 is a unique design with predicated power, a side benefit of a quiet earthy exhaust note that speaks...

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...

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year,...

* Over the years, the RS-2 has proven to be one of our best off-road mufflers. It's oval-shape and maximized muffler volume produce power throughout the rpm range, along with a nice exhaust note...

* With the success of Yoshimura’s RS-9 dual muffler exhaust system and the 2013 CRF450R used by the Muscle Milk Honda factory team, it’s only natural that we carry over the same technology for the...