Don't be fooled by its sobre appearance. The Alfa Romeo Giulia Quadrifoglio is as hot as an Italian volcano erupting. Along with its XXL-sized exhaust pipes (4 of them!), its rear diffuser, carbon ceramic discs, carbon bonnet, it also has something fit for a king hidden within: a Ferrari engine. To be more precise, a V6 2.9L twin-turbo engine, giving it a massive 510 hp. All that power feeds through an automatic 8-gear transmission system.