Cannons on any car will always be loud, even with the silencer. Personally i would have got an oval performance muffler (same shape to stock) and just got that upgraded and kept in the stock position so the noise is not as loud. You will find a silencer will probably not do a lot to reduce the noise. Now with a second muffler, i doubt u will get it on as the exhaust tunnel is fairly small and unless its round like your muffler, then it wont fit. If its too loud and u like the look of cannons, then think of maybe a mugen twin loop style. these have great performance aspects and they are quiet and they look bling!!

And What exactly is wrong with honda's high pitched noise???