yeah there are plenty of things you can do to get to 850 rwhp w/o changing the intake, mega boost, met etc... however if your after anaturaly aspirated bump in torque, the ATS will deliver. I notice a difference in part throttle response which is where I wanted it. Most of those saying negative things about it havent tried it (not saying Morse hasnt tried it), I speak from my own experience and my own setup. My ATS worked for me and its not leaving my truck anytime soon... having not tired the other intakes (and not planning on it) I cant really comment on them.