When motorcycles used to roar.
Turbocharging puts new life in the Yamaha 650cc engine; although the Turbo is just three-tenths of a second quicker than the standard 650 at the drag strip, that figure is deceiving. When the engine comes on the boost, the power surge is astonishing, and the Turbo tops out at speeds that standard Seca owners can reach only in Fantasyland.
via Motorcycle Specs.