Subaru talked a bit about the limited-edition Series.Gray WRX and WRX STI models when it announced the official pricing for all WRX models last month.

We didn’t have any images or much in the way of details on these limited-edition rides at that time. Subaru has given up all the details of the Series.Gray cars at Boxerfest in Washington D.C.

What we already knew of availability was confirmed again, there will be 750 Series.Gray WRX and 250 WRX STI cars offered with both landing at dealers this fall. The WRX version is offered with a 6-speed manual only and has exclusive crystal black silica badging.
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https://www.slashgear.com/subaru-series-gray-wrx-and-wrx-sti-unveiled-at-boxerfest-05532981/