Project Subaru EJ25 - Part 3. Turbo kit and reverse manifold setup installed. ... which allows our STI to maintain the factory location turbo configuration without having to switch to a rotated setup.

The EJ25 might date back to the Legacy 2.5 from 1996, ... In all likelihood, Subaru could work on a high-performance specification for the FA24 turbo flat-four.

The new FA24 2.4-liter turbo in the Ascent SUV seems like a likely candidate to power the next STI, as R&T contributor Bozi Tatarevic speculated in 2017. But until then, we've got the EJ25, and ...