Rb25det Injectors

[Coxie]

Hey guys just a question on injectors, I've got a RB25det sII and was looking at buying another stock plenum to modify to a front facing plenum. The 2nd hand plenum i'm looking at is complete with a set of injectors with purple plugs, but the seller isn't sure if they're aftermarket or not. Any idea on what they are? I thought my engine had stock injectors but I looked and it has grey plugs, unlike the other ones. So does that mean my engine has stock injectors (grey plugs) and this other plenum has aftermarket injectors? (purple plugs)

[Cjmartz2k]

Your grey plugs are actually faded purple.

[Coxie]

Oh ok, do they just fade from old age? Is there any other possibilities because they don't look like they've faded (same colour under the plug socket and everywhere else on the plug) or is this common for them to fade?