HOLLEY HI-RAM (105MM TB)
Things got serious when we installed the 105mm throttle-body on the Holley Hi-Ram. Holley also offers a 92mm top for the Hi-Ram, but you will need the 105mm version on almost any application except a turbo 5.3L. The tunnel-ram intake offered impressive peak performance, but torque production suffered compared to the stock LS3. Equipped with the Hi-Ram and single 105mm throttle-body, the LS3 motor produced 612 hp and 509 lb-ft of torque.