With Spark Plugs, my car's engine runs smoother and quieter.

I can tell the difference in fuel efficiency since I installed Spark Plugs.

The acceleration feels smoother with Spark Plugs installed.

My car feels more alive with Spark Plugs installed, like a fresh pair of batteries!

The engine runs more efficiently with Spark Plugs, and it feels like the car is more in sync with my driving inputs.