More Power For 2.7 BMW 'ETA' Cars (325e, 325es, 528e) This article applies to all BMW M20 2.7 liter 'e' (eta) cars. Examples include the E30 325e, 325es, and 325, plus the E28 528e. These cars with the 'lowly' eta engine are upgraded quite a bit -for fairly short money. First, you must change the...