What are the trade-offs involved with the installation of a bored-out

throttle body? I note two vendors selling these things:

http://www.teleport.com/~mvprd/ (MVP Products)

http://www.group-6.com/B-1.htm (Group 6 Performance)

The MVP page is fairly restrained in its description of the modified

throttle body. The Group 6 page claims 28(!) additional HP with no loss

in gas mileage.

As with many of these performance-enhancing parts, I'm thinking, "Some

Volvo engineers made a decision about the diameter of the throttle body

opening. Are their design goals in disagreement with what I'd want

for my car?"

Any input will be appreciated.

Terry

98 S70 non-turbo