Does a drag race only car need exhaust boxes?

door coupe body type
RWD (rear-wheel drive), automatic 3-speed gearbox
gasoline (petrol) engine with displacement: 5563 cm3 / 339.4 cui, advertised power: 179 kW / 240 hp / 243 PS ( SAE net ), torque: 400 Nm / 295 lb-ft, more data: 1973 Plymouth Duster 340 TorqueFlite (aut. 3) Horsepower/Torque Curve
characteristic dimensions: outside length: 4973 mm / 195.8 in, width: 1824 mm / 71.8 in, wheelbase: 2743 mm / 108 in
reference weights: shipping weight 1440 kg / 3175 lbs base curb weight: 1461 kg / 3221 lbs
accelerations: 0- 60 mph 7© s; 0- 100 km/h 7.4© s (simulation ©automobile-catalog.com); 1/4 mile drag time (402 m) 15.2© s (simulation ©automobile-catalog.com) 1973 Plymouth Duster 340 TorqueFlite (aut. 3) Detailed Performance Review
fuel consumption and mileage: average estimated by a-c©: 21.4 l/100km / 13.2 mpg (imp.) / 11 mpg (U.S.) / 4.7 km/l, more data: 1973 Plymouth Duster 340 TorqueFlite (aut. 3) Specifications Review