I very much doubt you can add a supercharger to the TCH, the gas and electric engines are very carefully matched, and the gas engine is not the same at the regular gas engine in the Camry, other Toyotas, or Scions. You can go to 18" wheels, as long as you go with appropriate tires to maintain the overall diameter. You will get a rougher ride, poorer economy, and shorter tire life, though.
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