I did a search on this and could not find anything about it. The dyno run where they tested the K&N the temperature was 11 degrees cooler. I am not sure but wouldn't that make the engine perform better? Maybe not 9.5 HP better, but maybe 3 or 4 HP and that is why people have not seen much improvement with the 8.

 

all dyno runs are corrected for ambient temp and pressure... if you look on the dyno you will see something called a correction factor (CF). The hp readings are multiplied by that correction factor to correct them to 59deg F and 1 atmosphere per SAE-J1349 specs.

 

Thnaks for your insight, i was not accusing K&N of fruad, just wasn't clear on the temp thing. Thanks for clearing that up.