I have a 94 Integra RS. I am going to get a greddy evo cat back and holley Airmass ceramic coated headers. Is this a good exhaust system? Or do you have any recomendations?

Yes, the GReddy Evolution is a quality exhaust system. I have one myself.

how loud is the Greddy? I have an Arospeed exhaust (I know its a piece of crap) and that thing is way to loud.

Are the Holley Airmass headers a good header. I was going to get the compu blue ceramic coated ones.