i have a 2007 civic ex sedan and i found a si exhaust of the same year....i was wondering if anyone else has done this mod and if it sounds good. i had a 97 accord with a skunk2 catback but it was too loud and got me all sorts of tickets...so i want something with a sound but not too loud. please answer if you have anything to help me out.

 

It looks as if the Si muffler will fix on the EX ext pipe. It is larger, so it will flow better and possibly sound louder/better.