Thier are no Dual Exhaust Bolt on Cat Back systems available, so if you want dual, you will have to have pipe custom bent..
As far as what style muffler to get..
I'm in love with my Dual Tip DTM round.. got 3" on my civic had 2.5" on my Probe. All other mufflers are just
if you wanna nice muffler get a MagnaFlow... Super Sweet...