Cranky,
When I was dyno testing my 428 last spring I took several air filters. One was the K & N big filter. I made a pull with the filter without any
oil in the filter. Then I used the Red
oil that K&N provides and made another pull. I lost about 4 hp when I added the
oil. Compared to my 3" air filter (that fits under my hood) I lost about 7 or 8 hp. when I put on the big filter without any oil added.
I was running a 750 holley, the air temp was about 80 degree and there was about 88% humidity. In fact it started raining before I finished all my dyno time. However, we did not make any carb adjustments while I was testing the air filters.
Before I got on the dyno one of our local (Chevy) Nascar trucks had been on the dyno testing several sizes of K&N air filters. His tests also showed a loss of hp when he added the oil to his filters and also showed no advantage in hp over his 4" Moroso air filter.
Just a little input.