The answer is yes and resulting in an extremely annoying sound and I like loud pipes. Brokenfixed had a set of Dunstalls on his bike and that is what they were open with a perforated metal plate near the end of the pipe for the exhaust to escape through. I hated the sound.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!