Without a doubt, go to SP. You might find a Toyota dealer or some other shop that would do a decent job on a task so simple as timing belt replacement, but who are you going to turn to when you eventually have an issue with you car that only a Supra expert can address? You will not find a technician at the Toyota dealer -- or anywhere else for that matter -- as knowledgeable as Larry and the guys at SP. Don't be foolish. Go to SP.