I've seen a lot of talk here about guys going to install Stage 1 on their 03's, or guys who've already done it. What I'd like to know, was the change worth the expense? Did you experience a good performance increase? Did the bigger injectors give you better or worse gas mileage? I'd like to make the change, but don't want to kill the economy. Enjoyable as it is to drive, I also enjoy the 31-32 mpg on the road.