What is the best way to upgrade the Ford S-Max engine for improved horsepower?

I'm looking to upgrade my Ford S-Max's engine for increased horsepower, but I'm not sure where to start. Can anyone offer advice on the best methods and products for this type of upgrade?

A great way to start upgrading your Ford S-Max's engine for more horsepower is to invest in a performance air filter. It will allow more air flow into the engine, resulting in better combustion and increased power.

Another crucial upgrade for increased horsepower is a cold air intake. This will lower the temperature of the air entering the engine, resulting in more power.