yea, i think we can all agree that toyota engineers left out 17 extra horsepower just to be asses.
i think we can all also agree that toyota engineers, even though that it is their life and they know the car better than anyone ever could, probably aren't that smart and left out something so that the stock ecu isn't programmed to run to it's maximum efficiency.
let me note: there ARE gains to be made by retuning. 17 whp though? near impossible. the ecu is programmed to give the max power VERSUS efficiency (long life of the car). if you are interested in getting power, you CAN get some more, but your car's engine health is reduced.