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Question:

Why can copper not be used as an exhaust pipe?

Why can copper not be used as an exhaust pipe?

Answer:

exhaust manifold and pipe are the hottest parts of an engine and Copper with its melting point of 1084 Deg.C is not suitable.
Actually, yes it can cause a MIL illumination. If the CV is bad enough to cause sluggish shifting or even cause a wheel speed sensor to give a slightly different reading than the rest. Although in this case it sounds like it is something different. Hate reviving old posts, but in case anyone might read this in the future looking for answers I thought I d throw my two cents in.
I read an awful lot of answers stating a corrosion issue for not using copper I am 48 years old I have been driving since I was 17 and I have never ever seen a steel exhaust that hasn't suffered with corrosion in fact every exhaust I have ever had to replace has been because of rust so this is not a suitable reason for not using copper ! I have also been involved with many heating systems and many of the old back boilers behind open fires were made of copper and had copper pipe coming from them and they would last for years so I don't see the heat being a problem either to be honest I think the only reason copper is not allowed is because the company's making exhaust systems would never make money if you had copper ones !!!
No. There is no sensor hook up to the CV joints.

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