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2 days ago, when my friend and I were under car doing regular maintenance services, we saw the whole exhaust has rust and a red color. My friend told me that could be high temperature from somewhere in the engine. He remembered that his friend's new car has this red exhaust system problem, and they brought the car back to the dealer. And the dealer person told them that the cause of the red exhaust system problem is from high temperature from the engine or some sort.
If that is the case, what should I do?
I don't how old is the whole exhaust system. I think it is at least 5 years old because of the rust and stock looking.
Assuming, the previous owners never replace the exhaust system. I believe I should just replace the cat.
Would replacing the muffler help the emission?
Thanks!
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