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yep no tunes for the toyota ecu... Your pretty much stuck with intake/headers/exhaust which seems to add a decent amount on these cars even with stock ecus. Other improvements such as lightening the car is also available. Last resort you always have the option of running nitrous
Lexus ECMs were difficult to crack ever since the 90s, and is even more complex today. After the so-called 'unintended acceleration' issue, Lexus will never allow anyone to fool with their ECM. Huge liability on their part, even if you are the one dickin with it.
our ecu's do very well with accommodating to bolt ons. There is no tune. The engine ecu is also connected with the tranny ecu. You start messing around and things are liable to f up.
Everyone will tell you, if you want to tune you need to look at a different car.