you can do it, and as long as you don't screw anyhting up while doing it, it won't hurt anything. Just keep in mind that 2-3hp on a car like the contour isn't noticable by even the most "calibrated butt dyno's" and is within the margin of repeatability of any chassis dyno. So basically, there is no way to verify if you even got the 2-3hp from it (ie, the claims are pure speculation, regardless of any testing people have done)
