What component is often replaced to improve engine performance and efficiency?

Replacing the fuel injector can significantly enhance engine performance and efficiency. Fuel injectors are critical components that precisely deliver fuel into the engine's combustion chamber. An efficient fuel injector ensures that the correct amount of fuel is supplied at the right time, which is essential for optimal combustion. This not only maximizes power output but also improves fuel economy and reduces emissions.

When fuel injectors become clogged, worn, or malfunctioning, they can lead to a rich or lean fuel mixture, resulting in poor engine performance, reduced fuel efficiency, and increased emissions. By replacing faulty or degraded fuel injectors, the engine can achieve better combustion, which translates to improved acceleration, smoother operation, and less strain on the engine overall.

While the other components listed can also play vital roles in engine operation and maintenance, they do not directly address the issue of fuel delivery as effectively as fuel injectors do in enhancing performance and efficiency.