4Runner "Chip"

Are there chips for the 4Runner that will increase horsepower and or torque? I have a 1999 V6 4Runner.

If so, what performance boost can I expect and what are the costs? Any downsides?
Thanks,
Jeff

There are many possibility to make your truck go fast as you want, there are many site offer performance parts which you need to find it but I know one that might interest you, and here it is http://www.urdusa.com