Was going to box in my stock upper/lower control arms and was wondering if I just put solid spacers in place of poly bushings if it was poss? Don't think I have seen this listed on the way to box in rear arms, was looking to save some money. I would put poly in the rear housing but not the arms. I am running about 400hp from the motor and launch about 2200-2500 in a mid 12 sec car which is approx 3100 lbs with me in it.