I prefer a loud pipe with a good deep thump that you can feel standing beside it. But I would have to admit that a worn out stock Mojave pipe sounds good too...lol If someone made a SILENT pipe that scored under 25db I would buy it and give the person a handshake.
I have a Cobra jet pipe on my 03 mojave 250...love the performance but it's way too loud. My vote would have to go to White Bro's...they sound so sweet but they aint cheap..lol. just my .02 cents
I have a White Brothers E series pipe on my 400 ex. its not to loud but i took some of the disc out of it last night and i think it gave it more of a destinct sound.