Really doubt it's a head gasket. They're not known to go on these cars at all and in the very rare cases they do, it's from some other crazy issue like extreme track driving.
Monitor it, but don't worry about it. "Smoke" could be from a lot of things. I started my WRX today that sits outside that it was billowing out 'white' smoke more than usual - all condensation/water. But it happens.
Could even be the coating from the inside of a new exhaust. Usually they smoke when new, but only in the first day of driving. Could still be if you just installed new exhaust parts.
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2017 BRZ Limited Performance Pack - Steel Cities Region SCCA / North Hills Sports Car Club
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