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S&S Cycle single bore EFI throttle bodies are designed to control the flow of fresh air into the engine. They play a big part in controlling the air/fuel ration in the engine as they control air intake. These parts are quite large allowing more air into the engine. This results in more power and thus improved performance. They are well tested before leaving the factory hence ensuring they are reliable and perform as expected. Top quality materials are used to construct them and this makes them high quality products that are durable and reliable. Their durability makes them suitable for use on both on road and off road bikes.