The high performance Hayabusa kit adds speed to the Smart Car with many new parts including a 190hp Suzuki engine. Some kits also come with upgrades to the axle, clutch, drive system, shifter, differential and exhaust system. With many companies you must purchase the kit and install everything yourself, while others provide complete installation as a package deal.
Decide what you are looking for. You can buy the Hayabusa kit and install it yourself, have it installed by a professional on your Smart Car, or buy an already upgraded car.
Search online for "Buy Hayabusa Smart Car" to find the widest range of retailers and private party sellers and to get a good idea of what the vehicles are selling for. Be sure you don't end up overpaying for it or paying suspiciously less than what you should be. Remember the old saying: if it's too good to be true, it probably is.
Contact the service department of your local Smart Car dealership for possible suggestions on where to obtain Hayabusa parts and installation.
Buy your vehicle with the information you've gathered from reliable sources and due diligence.