Helped a buddy look at a truck a few weeks ago, he ended up buying it... 2000 F250, ext cab, long bed, 4x4, 7.3PSD, auto, kinda rusty, and with about 250K miles on it. Was about 15 degrees out when we went to look at it, started great with out being plugged in, and we test drove it. Checked for blow by, none noticeable... Ran great, shifted good, and the seller was stuck on $5000. My buddy offered $4800, and we walked away... called back 2 days later and took the offer.
So a week goes by, the truck is now in my buddy's driveway, he starts going over it, as we all would... calls me when he checks the air filter, something we had not done when we went to look at it... thinking back, I wonder how we missed it.
Needless to say, the used 6637 filter I had given him was MUCH cleaner, and now he has a DIY intake... he is thinking of boxing up and mailing the filter back to the previous owner... to ask WHAT THE HE!! was he thinking??? That filter looks like it has been in the truck since it left the factory...
When installing the DIY, I did check the compressor wheel, the leading edges are slightly ragged, not REALLY bad, but noticeable. Will see if I can talk him into a WW... but not sure if a tight azz that had me put a used 6637 filter on his 250K mile truck wants to spend the $100 for a WW... (If it ain' broke... he would say)