Review on Donaldson B085011 Filter: 🔍 Superior Quality Air Filtration Solution by Tres Carmon

I just did a start and run test but there are so many factors that affect performance and fuel economy that I won't comment on them anyway. Sounds about the same. Pay attention to the installation situation. I have an early 1999 Ford 7.3 Powerstroke and it requires a short 45 degree elbow to replace the stock air cleaner housing. It's not a straight fit and people will say "you only need a small piece of 4" pipe", but that's not the case with the old body shape (OBS) or the early '99 7.3s.