I took the car out and was unable to beat my 6.4. In fact I lost some time and did no better than 6.85 or so. I attribute this to a couple things. 1) The weather is totally unfavorable (too warm and too humid) and 2) I am totally unwilling to do again what I had to do to get the 6.4 (pretty aggressive launch).

I also realized something else. A 0-60 run uses 1st and 2nd gears only. I will never see full boost in these gears due to the factory torque limits (dang computers). So the net is that it doesn't matter how much air I can flow if the computer is not allowing the engine to achieve full power.

A better test would be to measure a 30-60 run (3rd gear and above has no torque limit), but I have no way to do that with the equipment I have.

Oh...I just remembered. I cheated to get the 6.4 (Actually 6.38) by using some octane booster, which I don't have right now. Under similar conditions (weather, launch, fuel) with the other air filter, maybe, just maybe, I picked up 0.05s in 0-60 with K&N. You can see what total BS this is. There are too many variables that have bigger influence than the air filter. That's why I was more looking at the subjective seat of the pants aspects such as throttle response.

I hope that this is mildly useful and at least amusing. BTW Kick, I don't deny your concerns about dirt. I just put on so few miles that I would have to keep the car for 30 years for it to matter.