Maybe it's a jeep thing... I have noticed at highway speeds at a particular throttle position (somewhere under 10%) there is an audible high frequency noise like a 3000 hz square wave that resonates in the cabin. It seems to be dependent on throttle position. The slightest change in throttle will make the noise disappear completely. I still hear the noise using cruise control and there is no change in performance when it is audible. I have the ripp supercharger system installed with larger injectors and their tune but was wondering if anyone else has experienced this either stock or with the ripp system.