TDR, both direct and via a friend who is one step short of getting a Cummins logo tattoo.
So is mine, but I figure that if Cummins doesn't want them on their product that badly that there is probably a reason.
BTW#2, my racing is rallying, all on dirt/gravel roads, and I have not yet spotted any grit after the K&N filter in my setup. (Stock Mitsubishi Starion filter can with the stock MAF sensor.) Just sayin'....
Spray some of the filter oil on the interior surfaces of the filter can and then check it after a race. That was how I found the 'leakage' that I was seeing.
What is wrong with a 4bbl stock filter assembly? Is the intake too tall for it to fit? I ran an Olds Toronado filter assembly on my old '67 Ranchero where it's intake was enough taller than stock that the OE filter didn't fit.
I see no good reason to run an open element filter on anything with a closed hood. The HP loss from ingesting the hot air out of the radiator, not to mention the various driveability problems that can come from a hot carb, just doesn't make it seem like a good idea.