A quick and discrete addition to any muffler, the whistle tip is welded inside the muffler to produce an ear drum piercing noise upon acceleration in a car. This noise can be heard for nearly a mile. A recent craze started on the sreets of Oakland by Bubb Rubb (see definition), often described an going "woo-woo."
Nearly every muffler shop in Oakland is now installing whistle tips in a recent fad started ion the streets.
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