S&S “Stealth Two” high-flow air filter kit for Indian Scout and Victory Octane The S&S. Stealth Two air filter kit for Indian. Models features simple one-piece construction and washable cotton gauze filter media, for an increase in air flow of 127%. Fitment: Indian Scout, Bobber and Rogue (all versions): 2015 – 2024 Victory Octane: 2016 – 2017.