Having a Turbo is300 myself.The only person I would have install that kit would be LArry@Innovations performance. It is def a tricky car to work on and Larry has done everything from swapping my motor to doing my 6spd supra tt tranny conversion. Only downside is that he is in Orlando. But when dealing with this type of car its def worth the drive and he will give you the fastest turnaround time. Not to mention he has a tuner, Hector who is familiar with dialing in the car and tunning the is300 on the dyno.
Innovations Performance- Larry Mcneil- 407-699-5550

PS- feel free to PM me . I know a great deal of info with this car..It has taken me to hell and back.
-Matt