Obviously, the Speedmaster downdraft had no issues with airflow. Having no less than eight individual throttle-bodies ready and able to feed the flow needs of each cylinder, the individual-runner (IR) system offered plenty of airflow. The system was polished to perfection and the center-pivot throttle assembly worked well. As with any IR system, the key to success is not tuning at WOT, but rather getting the eight individual systems to cooperate at idle and part throttle. Even more than some of the other polished intakes, LS enthusiasts will likely want this based on looks alone. Equipped with the Speedmaster IR Downdraft system, the LS3 produced 601 hp and 508 lb-ft of torque.