errr... ur headers already match your car's needs perfectly... u will LOSE low end, not gain it. well, if u get the EX swap. so, if u Daily drive, get the EX swap in there and call it a day for the header.
if i was you, id just get a bigger down pipe... it LOOKS like its 2.25, but its double walled and is actually only 1.75... sucks...
also, whether its ceramic or SS, it's gonna look like shit in a few years anyways.
except Ceramic won't wont look like a gay rainbow hugging your engine...
also, i do believe that both headers are 4-1... the pictures are always 4-2-1, but if u read it or buy it, its one piece that connects to ur stock down pipe.
at least all the ones ive seen.