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FB25 Subaru Engine

The FB25 engine had coil-on-plug ignition with an integrated igniter for each cylinder. The spark plug caps, which provided contact to the spark plugs, were integrated with the ignition coil assembly. For the FB25 engine, cooling around the spark plugs was improved for a higher knock limit, increased power and improved fuel efficiency.Subaru EJ253 Engine - australiancar.reviews Subaru's EJ253 engine was a 2.5-litre horizontally-opposed (or 'boxer') four-cylinder petrol engine. For Australia, the EJ253 engine was first introduced in the Subaru SG Forester in 2005.