20+ F-250 and F-350 2WD/4WD 7.3L catback. 3" true dual catback exhaust features an X-pipe muffler and dual S-tube mufflers with dual 4" polished slash cut tips. Exits behind passenger rear tire. Connects to OEM or Stainless Works header system for a full performance exhaust. This catback system features our classic Redline sound level.