The Emissions Lab guy I was talking to was very emphatic that they will check EVERYTHING to make sure it all came over.
I would hope they would be lenient, but who knows...
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The way my emissions guy explained it was that all the new systems had to be there, but how you attached everything was left open to you. They didn't say you had to use all donor parts, you jut have to have all the donor emission systems. It is probably cheaper though to just use all donor . The way the fuel tank was explained was that it had to be superior to the OEM tank.