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Do I need to do a throttle body coolant bypass with a thermal throttle body gasket?

No, you don't.

The whole point of these mods is to reduce heat in the intake charge. Coolant running through the throttle body heats it up and consequently can heat the air running through it. The throttle body is small, and does not have much impact on the air charge. The intake manifold is larger though and can have more of an effect. By putting a thermal gasket in, you block heat from the throttle body from warming the manifold, thereby eliminating the need to bypass the coolant from the throttle body. Certainly you can do it and scientific testing would probably would show a difference. But you will never realize any performance increase from it.


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