The Dynatech CatBack Exhaust is the perfect addition to your Ford F150 Lightning or Harley Davidson Supercharged 5.4 In addition to looking great thanks to its dual tip stainless steel finish, the 4" dual tips provide for better sound and exhaust flow. The integrated x-pipe and mufflers even out the exhaust tone and flow to keep it sounding tough without being overly obnoxious.