The intake manifold is a core component of an internal combustion engine. It’s responsible for distributing air evenly to each cylinder. Performance intake manifolds can enhance airflow to boost performance.

The simple design of a throttle body spacer coupled with the promise of big performance boosts makes this tiny mod seem almost too good to be true. Here’s how throttle body spacers work, and which cars are likely to see the biggest gains.

The intake manifold is an important part of your car. It distributes the proper amount of air to the cylinders. But over time, intake manifolds can become faulty and spring a leak. A car with a leaky intake manifold may experience reduced engine performance.