I have a spider intake from a turbo car with light gray injectors and a normal turbo intake with red injectors. Is there any difference? The spider intake is missing one, I wonder if I can mismatch them.

bump?

Thats odd. I have an NA spider and a Turbo regular manifold and both have green injectors

grey/red tops or caps?

maybe they are the same injector and possibly the color indicates which factory it was made in. GM did some weird stuff like that. I'll mismatch them and start it with new plugs to see how it's squirtin' anyway.

In my XT6 the injectors have yellow caps and say "Denso" on them... does that help any?

Ok BBalls. Did the injectors with the red top look anything like these ones on the left? They came out of a turbo xt4. It would be nice to actually see a picture of the two injectors side by side if you have the means. Without that verbal discription only goes so far. I personally have not been able to find any spider manifold injectors, but would be willing to see what I can do to help. Thanks buddy