i have one on my truck. before i had my sct it made a difference. it did not raise my boost but it kept it from dropping when i would shift gears, so the boost would hold higher and pick up a little more power. now i have an sct, but i havent removed it to see if there is a difference. i also have a buddy who has one on his dodge and he has seen the same results and likes it. i have heard of guys who really like them and others who say they dont do much. i think it is worth the 80 bucks.