:shrug: Looked like a reference to the ecoboost to me.
Either way the engines are pretty solid. The 2.0L ecoboost makes more than the 2.5L turbo in the regular WRX. If it got better gas mileage than the 3.7L V6, I think people would buy it.
I was comparing power from the 2.0 ecoboost to the current 3.7 V6.