What is the source? If they aren't from someone you know, I would be a little leary of them. Just because injectors can be really sensitive and you don't know if they've been dropped or subjected to any bad situations. So it really depends on how much you trust the person you're getting them from. Also I would recommend taking them to a shop and having them inspected, but thats just me.
I bought mine used through an injection shop, the guy before me had them for about a thousand miles then he decided that they were too smokey. They have been great for me. Its just about how you feel abou them. I trusted the guy i bought them from, but thats just my case.
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