If its posted, it should be correct. I know, because of my job, that if you publish a data it must be taken with the best of your capabilities. Otherwise, is illegal to publish false data. However, you can see that the 10.1 HP gains are in the higher RPMS (6.29 RPM) which is ridiculous to count that as HP gains. Once you are at those RPM levels its time for you to be shifting to the next gear unless you really are into drag racing. If your not, just go with the cheapest one. Personally I have an INJEN CAI and I love the sound, but no noticeable gains.