When it comes to core racing colors, silver and Germany go hand-in-hand since the pre-war Silver Arrows days of Mercedes-Benz and Auto Union. And though Porsche tends to lean towards the original german racing color of white in more recent years, there's no doubt that its classic 1950s racers predominantly went silver. And one of the most popular modern Porsche silver colors is GT Silver Metallic (gtsilbermetallic; metallic UNI; M7Z / U2; Porsche).
Some say Porsche's non-metallic Brewster Green (brewstergrün; nonmetallic UNI; 22B; Porsche) is Stuttgart's take on British Racing Green. However, we'd suggest it's just another shade by Stuttgart of England's original national racing color. Where Irish Green goes just a bight lighter than a lot of traditional British Racing Greens, Brewster Green goes a bit darker. In lower light it can sometimes even look black, though under direct light the green hue and the relationship to the British national racing color is undeniable.