Sorry I didn't mean my post to come across as blinkered, but a 2.0l turbo engine, be it YB, evo or impreza are all broadly similar for given power outputs, most of the tuning improvements have come down to material technology & engine managent development, and fuel technology.

Bolt on modern management & turbo to a YB & it will do the numbers, simple as.

A lot of people love to knock them, but it just shows how far ahead of the game Cosworth were TWENTY SIX (26!) years ago producing a production 2.0l engine that is as capable & tuneable, that other manufacturers have only recently got close to!