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The pistons were made lighter by 1.4 g (0.049 oz) Fuel injectors from the GSX-R1000 were used, with smaller 44-millimetre (2 in) throttle bodies, called the Suzuki Dual Throttle Valve (SDTV) system.
Moreover, the need to reduce the extreme drag encountered at high speeds determined the Hayabusa's entire bulbous, and much-criticized, bodywork design.Though the engine changes were relatively limited, they still yielded a large horsepower increase, and brought the bike into compliance with new noise and emissions requirements.In 2004, market researchers from the US and Japan began working to identify which elements of the Hayabusa design had attracted so many buyers, discovering that, in spite of having its looks sometimes disparaged in print, customers were much enamored with the old Hayabusa.A redesign meant to strengthen the bike's appearance without departing much from the original found approval with dealers and focus groups.
Underneath the skin, Suzuki decided to save considerable development cost by keeping major portions of the frame and engine unchanged.
An exception was a response to the problem of the aluminum rear subframe on 19 models breaking when the bike may have been overloaded with a passenger and luggage, and/or stressed by an aftermarket exhaust modification, so 2001 and later Hayabusas had a steel instead of aluminum rear subframe, adding 10 lb (4.5 kg) to the 19 models' approximately 550 pounds (249 kg) wet weight.