I have used it before, but can’t say definitively how the chassis reacted to it. It was in fact worth 14lbs, but as everyone states – a really bad day for everyone if your bumper falls off. If you use the option, pour some hot wax in the ends after your shot. Easy to get out, but holds in the shot if the bumper gets lost.
We may not be the fastest on the track...but we're having the most fun!