I put the Edge EZ on my 06 and felt the same way, minimal power increase, not worth $450, also increased valve rattling, acceleration not as smooth as stock, I think this is because the EZ just adds more fuel and the timing gets out of whack. I took it off after 2 weeks and sent it back, got the banks Six Gun, much better and smooth power, never caused a check engine light, I am happy with the Banks but I wouldn't mind trying a Smarty to compare.