I know, it's an old thread. I am thinking of going from 6637 to the AIS simply for the cleaner look. However, I have a question regarding plumbing from the box to the turbo. PO had a K&N filter mounted to a K&N tube, but the tube isn't for the 7.3. I don't know what it is for, but it's not for the 7.3. What is the proper replacement piece?
I also have a AIS system sitting in my shed that i replaced with a 6637. I thought it was the stock air box until i took it out and wondered what the huge blue filter was. Sitting in my shed collecting dust. Right offer might motivate me to sell it. I also get 75% off UPS through my work so cheap shipping. Can take picks if anyone interested. Pretty sure the filter was fairly new.
Thank you for the link. I don't have the funds at the moment. Just getting things planned out for when I need to change out my filter. The 6637 will do the job just fine until then, but I figure to replace it with a cleaner setup instead of keeping it.
OK, like i said it just collecting dust. Im in no hurry to get rid of it. If your interested later on let me know.
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