Yes, bouncy barriers hould ruin you race when its not a mojor part of the race you are competing in, such as a F1 race. Of corse it should ruin the race because your not supposed to hit them and not many people try to push you into them (if they are racing properly).
But with banger racing that is a HUGE part of the race and is supposed to be used as a wepon.
P.S Barriers should ruin your race but not Nasa's day too;P