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Bob this filter cost $43.00 at O'rilleys auto, but you can get them most any auto store including napa, napa# FIL6637, or fleet filter,#46637. All you need for a ford psdis filter, piece of 4" dia. exhaust pipe 3" long and a 4 1/2 " clamp. I could tell instantly when I tried it out the difference in low end response. next week the installation of pryo, boost and tranny guages mounted in a pillar pod, with 4" turbo back exhaust. this old ford does a good job stock but always like to improve!! lolhttp://superdutydiesel.com/wiki2/tiki-read_article.php?articleId=38 this link should get you to DIY
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