it is not that it is really loud it is how deep it is. It is not high pitch loud. It is deep loud and it resonates through the bottom of the car. If you open the window you cannot hear it is well if that makes any sense. It is like bass which is non directional that is what I think makes it loud in the cab. Now for someone who is used to the wide open canister exhaust it is lower tone because of the sound range. great construction but the muffler is to dam close to the body and it rattles every once in awhile when you go over a bump or it hits that perfect rpm at a stop. piping is very clean I love that part. I wish the stock was that clean. The magnaflow is 2.5 but I am not going to take another chance and throw a wad of money in the hole.