Big bore engines are all about the flow, more air in and more air out, anything that slows that down, robs horsepower. The factory M8 intake manifold does a decent job in stock form, but starts getting in the way when trapped between 124 and larger cylinders. The stock polymer unit is also less tolerant of the additional heat that a big bore engine can make at full noise.The solution is the new S&S high flow cast aluminum manifold and a must have for top level performance in the M8 platform. Features & Benefits High-Flow, adds 3-5 hp Must have for big bore engines CNC Machined T6 heat treated cast aluminum Replaces stock, plastic manifold Includes new rubber seal Easy to Install. The item "S&S Cycle 55mm Cast High Flow Intake Manifold Upgrade Harley M8 Softail Touring" is in sale since Wednesday, May 5, 2021. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Air Intake & Fuel Delivery\Air Filters". The seller is "americanclassicmotors" and is located in Zieglerville, Pennsylvania. This item can be shipped worldwide.