Popular Hot Rodding tests a variety of header sizes and types from Hooker on a 427ci big-block Chevy to show power trends and performance advantages. Tests include 1 ¾-inch long tube, 1 7/8-inch long tube, 2-inch long tube, 2 1/8-inch long tube, 1 7/8-inch shorty, ceramic-coated versus painted, collector extensions versus no collector extension.