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
