Excelent point Jim about the air not hiting directly into the filter. If given the choice I prefer to have the air have to make a ninety degree turn, because air can turn sharper and faster than a heavy dirt particle. There have been air cleaners designed that way where the centrifugal force spins the dirt to the outside edge and the dirt exits while the air can make the turn and continue on. I think most designs now are based on the "straight shot into the intake" approach, thats ok for Drag racers running a few seconds on a clean surface, but not a great idea for long haul down the interstate through a dust storm in West Texas or Arizona, Nevada, etc. Filtration is the only thing between the good, clean engine and the dirty worn out one.
02 2500HD LT D/A SB CC 4X4 BLACK, Westin stainless nerf bars, BW GN Hitch,Racor 60S post oem fuel filter, Oil Guard bypass engine oil Filter. All synthetic fluids. Kennedy boost valve, edge, Modified air intake,EGT & Boost digital gauge,TransferFlow combo fuel & tool box, Air Lift Suspesion Bags Rear & compressor with remote, Bilsteins front & rear, Frontier front replacement bumper.