tailpipe

An exhaust pipe exhausting to the aft of the vehicle.

Holonym: exhaust system

This car doesn't have a tailpipe because it has sidepipes instead.

An exhaust pipe (on a vehicle) (in any configuration).

Today's cars emit less NoX at the tailpipe than their 20th-century predecessors did.

To fasten an object to the tail of (an animal) as a prank.