If you can tune on the track on race day, take the fenders with you. Tune the car without the fenders & if they allow, glue them on real quick with just a couple dots of CA glue. It doesn't take much to stick them on. If the car gains speed, leave it alone. If they create a problem, pop them off.Do you guys think its worth removing what the fenders weigh from the COM weight to add fenders? Would you assume this a good trade off? We have a fenderless scout car that runs very well. Our district race is approaching and they allow tuning but it must be the same main body. I interpret that as, we could add fenders.