What does a throttle body spacer do?

A throttle body spacer is a piece of metal that is bolted between the throttle body and the intake manifold. The theory behind a throttle body spacer is to swirl or directs air flow to maximize air volume at the intake manifold which optimizes fuel air mixture and combustion. Depending on engine/manifold design one could see an increase in horse power, torque or fuel economy.

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