I was wondering the same thing. I actually have an AFE cold air I was thinking on modifying to fit a 6637 but it's gonna take some cutting manipulating to get it in. It might be easier to just get a new setup jyst for a 6637.6637 filter tube ..I need one bad ..or does someone have a used one to sell ..does the material it is made out of matter ??? T/I/A/
Aluminum would be better than steel in this application. It's fine.
I used 4" exhaust pipe.
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