Get a exhaust Resonator here https://www.amazon.com/gp/product/B001AGKYT0/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B001AGKYT0&linkCode=as2&tag=bullshitkor01-20&linkId=Y7PMC3GXE734HFLV
So i’ve read a lot on forums about ford 5.4 having issues with the p0420 and p0430 codes relating to your catalytic converter failing. your catalytic converters can fail for many reasons, i.e your engine running too rich, contaminates in your exhaust, or they just plainly wear out. In my case I wasn’t getting any other engine codes and knew no prior history of the truck as I had just purchased it, I decided since it’s legal in my part of the woods to cut it out that i would do so and if there was any other problems down the road I would take care of it. The exhaust shop that did it warned me from the start that it would make a annoying rap sound almost like a backfire in the exhaust. He sure was right cause it was annoying as heck, so after researching I decided for about 50 bucks why not try a resonator and see what happens. A resonators purpose is to deaden the sound before the exhaust so I decided what the hell. After installing the resonator I am very happy as the exhaust sounds way better now then it did before.
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Post time: Jun-27-2017