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Reload this Page P0420 pops up after Header kit install
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2009 to 2014 F-150
3.5L, 3.7L, 4.6L, 5.0L, 5.4L, and 6.2L equipped F-150s.

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  #11  
Old Sun, October 3rd, 2010, 03:46 PM
jmt0645 jmt0645 is offline
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the noise is part of having headers. mine are the same way. i've forgotten about mine making noise till this thread
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  #12  
Old Sun, October 3rd, 2010, 05:38 PM
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martinoledad martinoledad is offline
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I kind of figured that. I had Longtubes on my other truck but that has been exactly a year almost and I just couldnt remember if they sounded like that or not.
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