Xtreme, Sport / 2.5 in Cat-Back 4.5 in Single Tips | 2011-2025 Dodge Durango 5.7L (21186, 14459)VEHICLE FITMENT 2011 2023 Dodge Durango RT 5. 7L V8 2011 2023 Dodge Durango Citadel 5. 7L V8 PRODUCT DESCRIPTION 2. 5" Cat Back, Dual Rear Exit with Single 4. 5" Polished Pro Series Tips Xtreme Sound Level Part # 21186 *For best driving results turn off "ECO" mode or Tune out 4 cylinder "ECO" mode. Sport Sound Level Part # 14459 Sound Level Xtreme Sport Pipe Dia. 2. 5" 2. 5" Exit Style Dual Rear Dual Rear Tip Style Single 4. 5" Single 4. 5" Tip Cut