I have the Japanese spec right hand drive IS300 4 cylinder 6 speed.
Does anyone know of a company that sells performance upgrade chips for this vehicle.

doubt you have a 4 cylinder IS300, especially when there is no Jap-spec IS

I live in Jamaica and for your information we have the RHD IS300
We have the option of the 4 cylinder 6 speed (MR2 2 litre engine) or the 6 cylinder 4 speed.(supra straight 6 cyl engine).
Next thing you are going to tell me is that we dont have the toyota 1300 or 1500 turbo starlet or the toyota station wagon caldina 4 wheel drive 2 litre turbo.
But hey I guess you live in Jamaica .....................RIGHT?

They don't call it the IS200 with that engine? (Or RS200 in some markets?) :confused:

You'd do best sourcing a chip through Europe, I suspect, which also has the IS200. Couldn't say off hand who makes what, stuck in the U.S. market as I am...