Find out from before how much (if anything) it will go up. Some companies do raise the rate, but its not a lot at all (nowhere near putting in a larger engine!).
Like has been said, make sure you get it set up properly after fitting it (doesnt mean you cant fit it and drive it around for a few days or a week before getting it set up), but do get it set up as soon as funds allow you to!
The power gains from the kit won't be that much (you won't get Ferrari acceleration), but they do add a bit of torque and power, and they make the car much more perky and driveable!
Good luck!
