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Power Strokes
7.3 Aftermarket
Life of a NAPA 6637
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[QUOTE="DP-TunerTech, post: 163875, member: 3911"] Yes 425 is what I found also and that is what concerns me. 425 is very low and looking at stock flow numbers, the 425 cfm is even more disturbing. Thanks for verifying that as 425 is what I had also. The 6637 and the Wix version 46637 show to flow at 425 cfm while the stock Wix replacement 46728 and Napa stock replacement 6728 flow at 640 cfm:jawdrop: So this means the stock replacement design by Wix and Napa actually flow 215 cfm more than the 6637. This is info from Wix and Napa not from me nor my opinion. I have links if anyone needs them. [/QUOTE]
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