Exhaust Manifold Questions for 01GT

[2001GTPEWTER]

Are the exhaust manifolds easy to replace?? I wanna keep the stock h-pipe set up with the Flowmaster catback kit on the car, but I wanted somewhat of a deeper rumble..Something that still sounds like an anniversary edition Mustang but much more tone. I've heard long-tube headers are a way to go, then again people have said the same thing about short headers..someones' lying to me. Also, whats' the difference between ceramic headers and aluminum, besides the price? Or am I looking in the wrong place?..Maybe I need a different exhaust kit. Maybe its' just me but I seem to hear a difference between the exhaust put-out on my car (from the inside) and other Mustangs of the same generation (from the outside)..What I might need is someone to drive my car past.