I put this muffler on my trac and was devastated. I failed to do my research on these mufflers and didn't realize this is one of the QUIETEST ones they make! If you are looking for an aggressive sound, DO NOT GET THIS MODEL OF FLOWMASTER! You can barely hear it at all. I'm swapping it out for an original 40-series asap. I've noticed as well, there seemed to be a breaking in period for these mufflers. It could be just me, but it seems louder after a week or two. The 40-series sounds a bit better, but as much as I hate to admit it, I'm still wanting something louder and more v-8ish. The fact of the matter is it just won't sound as good as a v8 does.