The Air Intake Replacement is a specific accessory for the HEBO brand Ctr II helmet that is placed on the top and helps to improve ventilation and keep the interior of the helmet cool. Made of durable and resistant materials, it is easy to install and replace, improves ventilation and keeps the interior of the helmet cool. While the Rear Spoiler is a piece that is located at the back of a helmet and its function is to improve the aerodynamics of the helmet and provide greater stability during use. The Rear Spoiler for the Brooklyn and TMX helmets of HEBO is a replacement piece that is used to cover the back of the helmet and help improve its stability and aerodynamics.Referencia: HCR2181