Performance Parts for an Automatic

[MadMax]

Originally Posted by why?

It certainly cannot help it. The car just wasn't designed for it, and more importantly the computer wasn't either.

Bullshit. If Toyota didn't want its customers to have the ability to shift their automatics into other gears, or if there was any risk of damaging the transmission in doing it, they wouldn't have designed the transmissions to allow it! Cars would have Park, Reverse, Neutral and Drive only; but as they are you can shift down to three other gears in the Yaris.

There's no harm in manually shifting an automatic, other than using more gas...