Any dyno is just a tool period. You make a change and put it on the dyno to tune for Max HP/TQ. One is not better than the other IMO they can't simulate real world racing. Like someone said before at the track you have varying conditions and have to lanch your car. What the wind resistance? How about the bite of the track? A CAI/Ram air and true breathing never comes into play on any dyno because there is no air movement. You want real world times and performance proof take your testing to the track and compare your 60fts times, 1/4 mile times, and MPH. Then you'll know for sure what your K&N is doing or any other mod for that matter................. Same day runs are a plus.