I think the stock Yaris has enough power

[1stToyota]

Originally Posted by BailOut

No one gets a trophy for getting to a red light first so speed is not an issue for me. This car can pull hundreds of pounds of people and gear over mountain passes so torque is not an issue for me.

I've done absolutely nothing to gain any speed or torque and I have never failed to get where I was going in a reasonable time and manner.

This proves that the car does indeed have enough power. Some folks want more power, but want is a long way from need.

99% of the driving population probably don't drive like you do...see them zoom by you every day? I do, and I drive 65-70mph
Driving habits are hard to change and most people have too much else to worry about to stay glued to a scan gauge's every movement.
If a John Deere can pull a length or two on you during every launch, then yes, the Yaris is all any one would ever need.