BR 420 Popular choice of the landscaping industry. Powerful, yet comfortable to use all day long. With IntelliCarb compensating carburetor and a catalytic converter for reduced emissions.   BR 500 New low sound blower - only 65 db(A) - powered by the patented STIHL 4-Mix engine. Built with more power and greater fuel efficiency so that you can work faster and longer.     BR 600 Our top performing professional backpack blower. The BR 600 not only feature the patented STIHL 4-Mix engine, but is packed with comfort features like a simplified starting procedure, reduced vibration levels and a newly designed dual adjustable shoulder strap.