loud meaning only when you get on it right??? I hate so see cars with loud mufflers and there are only going 25-40mph I hope by loud you mean nice deep sound . well as for bolt ons there are plenty to choose from as for loud you can go with the greddy evo for example and for quite and most popular for accord owners apexi ws2 which is real quite and has a hmmmmmmm sound while driving around and opens up when you get on it . but bolt ons are a lot of $$$$ custom (from a muffler shop ) the cheap ebay mufflers will be real loud or you can go with a mangaflow street series muffler and get a nice hmmmm sound and will open up when you get on it I know because I have one also the apexi n1 with custom piping is really loud well the is my $.02 good luck