02 Silverado 5.3L with ACDelco A1618C "Duramax" air filter and K&N 10" H20 filter restriction guage:
I'm surprised the filter is that restrictive or clogged since the truck does not see off road usage everyday (maybe 4x a month). Filter is installed on October 2012 and I did a WOT run to get max restriction. I switched the OEM to the K&N filterminder since the K&N is more sensitive (OEM is 25" H20 from what I heard.)
Could the airbox cause restriction? I also have a filterminder on my dad's Toyota Tundra and with a cotton gauze filter it showed restriction under WOT. It wasn't until I cut opened the bottom of the airbox and changed the air filter to a Denso that it didn't show restriction under WOT. Exhaust tone changed a whole lot too. Sounds like I've got a Flowmaster when I still have the stock exhaust.
I'm surprised the filter is that restrictive or clogged since the truck does not see off road usage everyday (maybe 4x a month). Filter is installed on October 2012 and I did a WOT run to get max restriction. I switched the OEM to the K&N filterminder since the K&N is more sensitive (OEM is 25" H20 from what I heard.)
Could the airbox cause restriction? I also have a filterminder on my dad's Toyota Tundra and with a cotton gauze filter it showed restriction under WOT. It wasn't until I cut opened the bottom of the airbox and changed the air filter to a Denso that it didn't show restriction under WOT. Exhaust tone changed a whole lot too. Sounds like I've got a Flowmaster when I still have the stock exhaust.
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