Quote:
Originally Posted by Jakins
What would happen if I added headers or maybe the exhaust manifold that doesn't have the cat on it. Now that I have the Guino I can test if it would be better or worse.
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Not really sure. I have read both sides and have mixed opinions on the matter. It would be an interesting test if you had the parts readily available for free or at a cheap price. Be sure not to throw out or scrap anything to ensure you are getting better results. I would really stink to get worse and then be able to go back to stock form.
I occasionally get the P0420 error and ordered a rear O2 to try to fix it. I suspect it is the Cat, but trying the cheaper option first.