Flowmaster's unique, patented Scavenger Series Collector is founded on the principle of PULSE TECHNOLOGY. The large "D-shaped" ports in the the Scavenger Series Collectors create a larger surface area to help pull the exhaust pulses from the the opposing connected cylinders This creates a cleaner burn for the incoming fuel and air resulting in an increased and broader torque curve putting more power in the rpm range were you need it most. After all, its torque that moves your vehicle.