SLOW-PRO

What is a regrind cam? Will it make much differnce? And what specs should I ask for when having this done,if its possible. And should I get a new one to be ground or will a used one work? Just curious about how and what it meant.And also what about headers how hard would it for some shop to make some? Thanks for the time, hope someone can help me.CAUSE MY CAR SO DAMN SLOW!!!!!!!!!