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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
Greys weren't original equipment for a turbocharged YB. By modifying the end of the caps you retain the correct length, and therefore a better/safer fit into the inlet. Fitting unmodified caps affects the flow/spray pattern in a negative way for the YB.
Update...i have found out that the caps are there to hold the components on the injector as apparently it is a pain in the arse when putting them into the manifold without them