What is this 6637 mod you guys talk about?
#2
It is taking off the stock airbox and filter and replacing it with a napa 6637 filter. All you need is the filter, a 4' peice of 4' exhaust and two hose clamps. It gives better flow and more turbo whistle without all the money for a new AIS. Look in the sticky thread for common mods its in there and most of these guys have pictures in there galleries of it. I have all the parts just waiting for a break in all the camping in fishing to do mine.
Hook
Hook
#3
Join Date: Jun 2003
Location: Ardenvoir, Washington
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Here is a forum link which show you a pic of the filter mod.. and other info you might find helpful.. Would suggest doing the CCV (crankcase vent) mod at the same time..
https://www.ford-trucks.com/forums/s...78#post3746678
https://www.ford-trucks.com/forums/s...78#post3746678
#4
Join Date: Jun 2003
Location: Ardenvoir, Washington
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Here is a forum link which shows you a pic of the filter mod.. and other info you might find helpful.. Would suggest doing the CCV (crankcase vent) mod at the same time..
https://www.ford-trucks.com/forums/s...78#post3746678
https://www.ford-trucks.com/forums/s...78#post3746678
#5
i did not need any thing but two hose clamps. i took the boot and heated it up, slid it over the filter neck, and took apart two smaller hose clamps and made one big one to go around it, as the stock one did not make it by a hair. since then i have replaced the CCV inlet tube with a piece of 4".
#7