Back to Stihl Products Model BR 320 BR 400 BG 75 Displacement (cu.in.) 2.73 3.44 1.55 Engine Power (kW) 2.0 2.5 NA Weight (lbs.) 18.5 18.5 9.5 Fuel Capacity (pts.) 3.17 3.17 NA Air Flow Rate (cfm)  With Tubes Without Tubes 435 589 476 624 377 377 Air Velocity (mph) 163 179 135