NOISE (noun)
1. sound, especially of a loud, harsh, or confused kind: deafening noises.
2. a sound of any kind: to hear a noise at the door.
3. loud shouting, outcry, or clamor.
4. a nonharmonious or discordant group of sounds.
5. an electric disturbance in a communications system that interferes with or prevents reception of a signal or of information, as the buzz on a telephone or snow on a television screen.
6. Informal. extraneous, irrelevant, or meaningless facts, information, statistics, etc.: The noise in the report obscured its useful information.
7. Obsolete. rumor or gossip, especially slander.
From
http://www.dictionary.com/browse/noise?s=t
SOUND (noun)
1. the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium.
2. mechanical vibrations transmitted through an elastic medium, traveling in air at a speed of approximately 1087 feet (331 meters) per second at sea level.
3. the particular auditory effect produced by a given cause: the sound of music.
4. any auditory effect; any audible vibrational disturbance: all kinds of sounds.
5. a noise, vocal utterance, musical tone, or the like: the sounds from the next room.
6. a distinctive, characteristic, or recognizable musical style, as from a particular performer, orchestra, or type of arrangement: the big-band sound.
7. Phonetics.
(a) speech sound.
(b) the audible result of an utterance or portion of an utterance: the s-sound in “slight”; the sound of m in “mere.”.
From:
http://www.dictionary.com/browse/sound?s=t
So, it wold perhaps have been more precise to say "the Staintune makes a more agreeable sound than the OEM pipe".
That said, from the above, a sound is a noise and a noise is a sound.
