Rumble packs imop are very loud. At least the one my cousin had on his F6 was. It was rediculous. I liked the sound, but like the guy above said, loud sleds=closed trails. I know some companies make cans called "quiet cans" but I don't know how they sound. The thing about loud sleds is this, people who put on piped or cans because they enjoy the sound is one thing, but the people who put them on to get attention from people is another. My point here is this, yes loud sleds can close trails, but those trails are usually the ones that are right by peoples houses, once out in the woods away from town, blat away, just be respectful. Yes canned sleds are loud, but it is all operator. Just put through town, you will be amazed even with a can that it won't be that loud until you open up the powervalves.