in the subi relm, the UEL header is just due to the way that its routed, i dont think they make one fo the honda crowd sense nothing in a civic has dual banks (like a V or a horizontially opposed motor) but if your just trying to keep it from having the fart can sound, just make sure your system has a resinator, and if you dont have to worry about smog testing then replace your cat with a second bolt in resinator, that should take car of the rasp that your refering to,
and just a little food for thought, it a hi reving 4 cyl. its always ganna be a little nasty, lol you just have to find what your willing to tolerate.