Ok. No green... So then go with the 6637 filter mod? If so, what brand is it?

 

I believe the wix number is 46637. Any truck parts house should be able to cross the 6637 number to match the filters they carry. While you're there you will want to pick up a 4" inside diameter piece of exhaust pipe. You may or may not need an elbow to install it. You might need to remove the battery box and modify it to make room for the filter. That depends on your truck, some do, some don't. My 97 didn't need to be removed. My 02 needed to be removed and modified. I used a sawsall to remove the air filter box and re installed the battery box, minus the air box.

 

Welcome to FTE.

This is a NAPA part number. The elbow mentioned is also a NAPA item, P/N 41632, I believe.

I bought both of these at my local NAPA store. I've heard that FleetFilters.com has the 6637 filters for a good price. NAPA gives a discount to AAA members. I put mine together for less than $80.

Check the link in my signature. I haven't bought a filter cover (as mentioned above) yet, but it's on my list of "Want to Get" items. I'm still working on my "Have to Get" items list.