depending on what you need done you can also bring it to the dealership.
I work for lexus and have plenty of time with the 2jz motors. We also have alot of people who have modified IS 300's, 350's supras's and SC's that come here to get work done. It just depends on what you want. We dont have the capabilty of tunning. But you would have a Lexus cerified tech working on your car.