I love the sound of the LM, Catted Y, and headers. The inside is a bit louder but it doesn't bother me and reminds me of a racecar. Everyone that rode in it or heard it loves the sound of it. At wot its really loud but thats what I wanted anyways. Around 2000-3000 rpms its makes a funny sound that is hard to descibe but it sounds really cool and highway driving isn't any different then driving on stock manifolds. This is my favorite mod I did so far and I definetly noticed a lot more power throughout the whole rpm band.