These plugs are life saving devise for anyone who travels by an auto rickshaw (we Delhiwallahs call it a “three wheeler”. Good plugs cut out the noise substantially. The tired feeling after 20 kms of travel is mainly because of the noise.
You get to your destination fresh. Half of the noise is due to your own “Three Wheeler” 🙂
Another life saver is a gas mask…………the exhaust pipe of buses and trucks are designed to belch their output directly into the three wheeler, and your driver manages to keep it that way, for fun and kicks.