I have the AEM Brute Force. It took a few weeks for the truck to "learn" the new intake. (Yup the PCM needs time to learn the new set up) As for performance? Throttle response is quicker, the sound, I can't tell as the Magnaflow is loud as hell, and gas mileage is somewhat better. I average 16.5-17 MPG. As for WOT it hauls a$$. I have a friend that has a 04 hemi 4x4 and has driven my truck and he is very impressed with the performance. Most people that ride in my truck think I have a hemi under the hood. When they ask I just say nothing. I keep them guessing.