5sfe, custom exhaust Options

[6gcnoob]

hey guys. looking to do a full custom exhaust on my celi. planning on doing 2.25" or 2.5" piping, not sure which would be better though.im buying those ebay headers everyone loves so much,a magnaflow HF cat converter, and a generic/universal muffler ( 2.25" inlet, 4" tip). only thing though, cant seem to find a flex/down pipe to replace the original size and should i run a resonator or leave the stock one, at least i think its one, its more near the gas tank? any suggestions or description of how you run your set up would be helpful.thanks