1971 NOX exhaust option

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This may be dumb, but what is a NOX exhaust?

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Not dumb at all. I think the OP is confusing 2 separate options;

Option code N95 - "Nitrous Oxide Emissions Control" which, AFAIK does not affect exhaust system components.

Option code N97 - "Noise Reduction Package" which does affect exhaust system components.

-Alan

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The reason I asked the question is,I have a 71 340 4 speed Cuda and was going to order a back up harness.Year One has a harness but has two available,one with NOX and one without.What do you think the difference is? Has anyone ever heard of it?
Thanks for any replies.

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I see what you mean after looking at the listing. I think they are referring to the N95 option. I would say if you don't have the part shown in 71redcuda's pic above then you don't have N95.

I have heard of the option (it was mandatory in California in some cases), but don't know what exact changes it made to the wiring.

Maybe contact M&H Wiring (they make the harnesses Year One sells) for more info. http://www.wiringharness.com/

- Alan