I'm thinking about getting a supercharger fitted but as I didn't even know that there were bolt on kits for the IS200 until I stumbled across this place, I've done a fair number of miles. 103k to be honest.
I mentioned my plans to a mechanic friend and he made that whistling noise they're all good at and then started chanting "never tune a top end if the bottom end is old."
Are there any known issues with supercharging a high mileage IS?