Thanks to the ubiquity of text on the Internet, not to mention the popularity of text-messaging on cell phones, we may well be reading more today than we did in the 1970s or 1980s, when television was our medium of choice.
A larger throttle body delivering air at a higher rate helps you feel faster acceleration and a surge in engine power by up to 25 hp. Additionally, you can install a throttle body spacer to further enhance your fuel economy and increase engine torque.
A bigger throttle body will allow more air into the engine and will somewhat improve the throttle response. More air = more power. A 70mm throttle body is a nice step up for stock or lightly modified 4.6 engines. A 75mm throttle body is a good step up for cars with a good number of bolt-ons. If you decide to go up to the 75mm TB you should get the car dyno-tuned immediately. Flowing more air means you need to flow more fuel to avoid going lean in the critical Air/Fuel ratio. The addition of an upper intake plenum, a throttle body, and a high flow intake with proper tuning can show nice results.