my rear spring idolators are torn so when i put my new springs in i started hearing squeeks and stuff, i need to replace them all, now the question is should i get polyurethane ones or regular rubber ones... i was thinking since the urethane ones are stiffer, the car would raise a little bit but if i replaced them all witht stock rubber ones it would settle and lower back to normal... what do u guys think

 

anyone, would the urethane isolaters raise the car a little bit because of the stiffness? should i just go with rubber?