I know when the car was fairly new some shops were doing supercharger solutions. I tried looking now and can't seem to find anyone. I just want to add a little more power to the car. Nothing too crazy. TIA.

 

As far as I know, there are no mass produced kits for IS300s currently. Nor for any 2JZ powered car. There is one or 2 companies in Japan that do custom incomplete kits, but I have only seen them for the JZA80 Supra and the JZS160 Aristo. Those kits are sold via Yahoo Japan auctions and are made to order, and they use HKS rotrex superchargers. In theory, you can contact them and see if they will sell you a supercharger and the mounting bracket. Everything else would have to be custom done here in the USA because the IS300 engine bay is so vastly different than the Aristo or Supra.