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Now a usually mod is to increase the diameter of the throttle body to be able to get more air in to make more power.
Which is going to be limited by the other end of the throttle body. You can only put some much air in. Lets use a simple measurement. If you have a 2 in hole that is putting air into a 2 inch hole great. Not lets say you want to put more air in. You can't just get a 3 inch hole that goes into a 2 inch hole cause you are limited by the smaller size. Which is why a TB isn't the best idea like others have said. F/I heavily modded. Although the BBK looks pretty cool.