K N Performance Air Filter Pontiac Sunfire With K&N Air Filter And Performance Spark Plugs?

Pontiac Sunfire with K&N air filter and performance spark plugs? - k n performance air filter

I have a Pontiac Sunfire 2002 and I have a K & N air filter and spark plugs in their performance and I have not noticed any increase in power or mileage. Things are good to add the power and mileage, or I lose my money?