S&S Cycle Single Bore Tuned Induction Air Cleaner System Chrome with Red Filters 170-0089 The heart of this induction system is the dual runner, 2-into-1 intake Instead of bolting directly to a dual bore throttle body, the runners of the single bore induction join together in a smooth, flow enhancing curve Air filter area almost 2 times that of an S&S teardrop air cleaner The intake is available in chrome, wrinkle black powder coated or natural finish Tuned induction kits for 08-11 Touring models with electronic throttle control are designed to bolt directly to the ETC throttle body without an adapter bracket