I was just cruising the AFT site and the first Indian Scout picture that I saw shows what appears to be a very similar air filter to the S&S model. Maybe the good folks at S&S know a thing or two about performance.

Yesterday I installed a S&S Stealth air cleaner on my 2017 Scout. There is a pretty big difference between the stock air filter and the S&S. The bike sounds much deeper than stock. It was too cold to take it for a spin plus I'm waiting for a proper tune from Fuel Moto, sent them the ECU info...