Engine

From SubiWiki

Horizontal 4 NA

Designated as the 2.5i: Naturally aspirated (i.e. non-turbo) version of the Subaru horizontally opposed 4 cylinder boxer engine

Horizontal 4 Turbo

Designated as the GT: Turbocharged version of the Subaru horizontally opposed 4 cylinder boxer engine

Horizontal 6 NA

Designated as the H6(?): Naturally aspirated version of the Subaru horizontally opposed 6 cylinder boxer engine