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In the case of. the 4.6L 2-valve GT motors, the stock throttle body and elbow were certainly restrictive, even in. stock form. The stock throttle body and inlet elbow become ever more restrictive as the power. output of the naturally aspirated combination is increased, meaning that a throttle body upgrade.
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.