Alfa Romeo is celebrating its 100th anniversary by giving its compact luxury sedan fresh styling at both ends. Most Giulia models house a turbocharged 2.0-litre four-cylinder engine that serves up 280 horsepower, but the star of the lineup is undoubtedly the Giulia Quadrifoglio with a Ferrari-sourced, twin-turbocharged V6. How does 505 horsepower sound to you? If only the Italian brand had a better track record when it comes to reliability…