It's official, the 911 made it to 50! Celebrate your cars' birthday by getting the right Porsche 911 parts for it. The 911 has evolved like no other car in history. Always new and yet always the same. No matter which year or model you own, there is no way to mistake a 911. Despite its reputation as a high performance machine, the largest engine ever put in a production 911 is a 4.0 liter version of the flat 6 cylinder.