Well my 0.02 cents....I have run K&N air filters
for many years of drag racing and on the street..had my car dynoed many times...and the K&N cone type always flow the best. Never had problems with dirt getting into motor and I take off the intake a few times a year and its spotless inside. K&N also dynos their applications so you know how much HP yor going to get and they can't lie about it becasue every performance mag out there has tried them and reported the numbers on various applications.
I have never had a problem with the mass air; maybe if someone over oiled the filter and did not let it dry they may have an issue.
As for true flow; while I have never used one...my thoughts:
- I watched the video and they used a K&N without oil which nobody would ever use? Why? I find this kind of a dishonest comparison.
- Also my main issue with the design is the filter has two purposes...filter the air...most will do this great even the cheap paper. But function two is to allow as much air into the engine as possible....I assume this is why 99% of everyone that buys these filters/intake tubes wants one for the possible promise of a little more HP. Well True Flow has no numbers on their applications and admit that the K&N material flows better.
Personally I like K&N and have put 100s of thousands of miles on them with many applications and only ever had good results. Just clean it when you change you oil; oil it and let it dry.