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Old 08-02-2009, 10:28 PM   #685 (permalink)
bmarcinczyk14
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Quote:
Originally Posted by FuszNissan View Post
Yes, they should. Stillen headers are made to hook up to stock cats, and FI HFC are direct replacements of the Stock HFC.
are the stock cats really considered high flow? if so, are they as high flow as the fast intentions cats?
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