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I don't have a lot of experience with intakes for the 3IS, however the 2018 IS300 F-Sport should be able to use any intake designed for the 2014+ IS350.
Is this an AWD or RWD. If its the RWD it's the turbo motor and the intakes for the 16+ 200t fit it. If it is a AWD then any of the 14+ 250/350 intakes fit.