There was a time when special versions of the Subaru WRX STI were exclusive to Japan, like the S20x "series" which started with the S201 up to the S208. 

This year, however, that is about to change.

Subaru recently announced that the WRX STI S209 is heading to the US and will make its debut in Detroit, marking the first time an S20x model will be offered outside of Japan. 

Since 2000, Subaru has offered special S20x versions of the WRX STI starting with the S201. Every couple of years, the Japanese automaker continously rolled out a new model with the latest being the S208 introduced last year based on the current WRX STI. These special edition models are usually limited in numbers and comes with a more poweful engine, upgraded suspension, and a more aggressive aero kit. The S209 continues this nearly 2-decade long trend. 

In a teaser video, Subaru is giving us an early peek at the hardcore WRX STI S209. We can see that the S209 will have a large fixed rear wing and gold BBS wheels – the same parts found on the limited edition Type RA. Curiously, it does have new wide fenders as well a revised front bumper fitted with canards. The rest of the body will likely remain unchanged from the current WRX STI.

What we don't know anything about for the S209 is its engine. At the moment, it is still uncertain whether the S209 will use the US-spec EJ25 2.5-liter flat four or the more powerful EJ20 2.0-liter flat-four motor found in Japan model WRX STIs. For comparison, the S208 pushes out 325 PS while the Type RA offered in the US produced only 310 PS.

The Subaru WRX STI S209 is set to debut at the 2019 Detroit Auto Show on January 14.