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I think the IS300 is just a detuned 3.5L V6, because Lexus hasn't had time to fit/test the 200t 2.0L turbo into the AWD configuration.
The 2017 Refreshed IS due late 2016 may be available in IS200t AWD.
Don't feel embarrassed or anything most people have no idea what type of engine a car has. I remember many times my friends said that an ml350 is turbocharged or that an 535 is twin turbo. Someone even thought that my GS was supercharged.