I've had my America for about a year. Most of that time I have had debaffled pipes, and recently I had the 12,000 mile service, a freak installed, and the AI removed. My concern is that I am not feeling a performance gain; I know the top end is lower than it used to be (pushing past a ton was easy before the mods). It sounds different, but it does not feel like more horsepower is available. Kieth at RPM also said that I went from 140s to 180s with 2 shims when they rejetted, and I would notice a decrease in gas milage. That seems to be quite different from most of what I read here on the board. Another symptom I do not like is that it acts like I am running out of gas unless I am accelerating. It never had that before either... Am I crazy? Is it just me being overly paranoid?
