http://www.ukipme.com/engineoftheyear/categories.html a.. Best New Engine - Porsche's 3.8-liter 385bhp flat-six b.. Best Performance Engine - Mercedes-AMG 6.2-liter V8 c.. Sub 1-liter - Toyota 1-liter three-cylinder d.. 1.8-2.0L - Audi 2-liter TFSI e.. 2.0L-2.5L - Mercedes-Benz Diesel 2.1-litre BlueEfficiency f.. 2.5L-3.9L - BMW 3-liter DI Twin Turbo g.. 3.0L-4.0L - BMW 4-liter V8 h.. Above 4.0L - Mercedes-AMG 6.2-liter V8