Everyone I know said this is a heck of a big muffler for the Altima 03. I was also surprised at how big it was when I got it because I bought it , without looking at the information. I just installed the muffler so I don't have a full exhaust yet (can't afford all that). It's not loud or annoying like those pesky Civics all over North San Diego (3000k fog lights or high beams). This is a deep tone and perfect volume. I installed it and the Midas guy thought it was a great coffee can silencer. Pros * Perfect deep sound * Not too loud * Carbon fiber and high gloss finish * Versatile Cons * Damn big (the solution was to raise the muffler)