i opened up my air filter box because
there was a plastic plate that sat against the filter and only had a 2.5" hole in it!!!! Before the delete, i would change the filter only to find a very dark spot on it about 2.5" in diameter, the rest of the filter was clean!!!!! and this filter is like 10x12!!!! lower tone now....maybe it would sound okay then???
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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