I think Nemessis looked into this several years ago and decided to go supercharger instead because the turbo takes up too much room in the engine bay. We already have only enough room to fit a skinny thermo fan between the engine and radiator with the rear of the motor hard up against the firewall. The turbo pipes on the Lexus I think run behind the motor, so no room. One guy on 4wd action or downunder 4x4 was fitting his turbos under the wheel arch above the tyres, but I doubt if that would be legal and would surely look sus.
Ric