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2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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custom tunes and vehicle emission
should i put my truck back to stock like a week b4 i take it in for emissions so it can reset everything
or could i leave it on my custom 87 performance tune.. thanks |
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