OK, so the higher the number the worse the injector?
What values do you guys get?
Since 6 is perfect should I replace only one or more?

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4.8is 2004 imola red
4.8is 2005 Black on Black - DINAN/2 sold
4.4 2004 X5
2003 330xi
2008 328xi - sold
4.4 2000 X5 - sold