Every car’s engine requires intake and exhaust manifolds. Your car’s engine is basically nothing more than an air pump. This means that the more air you can flow in and out, the more efficient you can make it, and the more work you can get out of it. Replacing the stock intake and exhaust manifolds with high flow components will help your car breathe better and make more power. As long as you aren’t running it like a race every day, you will also see gains in fuel economy, or the miles per gallon that it delivers.