Yeah, I doubt it too...big time. I think how they (K&N, that is) arrived at that number by doing the math from their statement (in their FAQ section), "We expect you to feel a difference when you stomp on the accelerator after installation. We have generally designed these kits to increase horsepower and torque between 5 to 10%."stang2001GT said:That website says 'Up to 26 HP gain'. I doubt any car got 26 HP from just this. What are the more realistic numbers for this install?