catback

Etymology

From cat + back, sense 2 (the back of a cat, for riding upon) is modelled on horseback.

noun

  1. The totality of components which exhaust gases flow through after exiting a vehicle's catalytic converter.“Corsa Xtreme Catback Exhaust”
  2. The back of a cat (for riding upon).“Aun Yom's attack [on the lokopede] would require storming the carriage cars but only after sending in some leg breakers on catback. A well-aimed strike from their sweeper scythes should be able to take out a dozen legs at once.”