For all of you that use a Big Honkin' Air Filter like myself. While back I quit putting the air filter minder in the head of the filter, well I went a bit too long on this filter even though the restriction is minimal really didn't see any huge temp difference per se. Now changing to fresh BHAF supplied by @dieselautopower and got it installed. Very small changes in temperature did occur. Coolant is down about 3 degrees, engine oil temperature is down about 3 degrees as well. Now EGTs really didnt change a lot but cruise state seems a tad cooler hard telling. Now as for MPG just making the trip down for my chemo appt. I only used 1/8 of fuel for 125 mile trip.

 

I did go toe to toe with a sport car running the canyons. Kind of fun to have quicker spool and just a bit more fuel/air mix keeping heavy throttle usage a bit lower in EGTs even on level 5. 

Edited May 7, 2024May 7 by Mopar1973Man

Here is a link to the longer skinnier BHAF2 you ordered if you need another:  https://www.dieselautopower.com/big-honkin-air-filter-2.html

That is the size, 12⅜" X 8½", I have on my truck.  

Here is a link to comparative size data for BHAF in the 24 valve 2ed gen, engine air and exhaust section. 

https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation_50/51_engine/air-exhaust_56/big-honking-air-filter-r566/

 

Edited May 14, 2024May 14 by IBMobile

So what is different from the Wix 42790?

 

Mark 

It is a little longer and thinner.  Fitment is a little better.