A vehicle includes a vehicle body defining a front wheel well. The vehicle body includes a rear wall vehicle-rearward of the front wheel well. The vehicle includes one or more cables supported at the rear wall. The cables are movable from a slack position to a taut position. The vehicle includes a pyrotechnic actuator operatively coupled to the cables to move the cables from the slack position to the taut position upon actuation of the pyrotechnic actuator.