depende sa application mo papi..no need for polyurethane bushings if you will drive your car daily..and by your statement na makalampag..meaning sa suspension and pangilalim gagamitin ito..replacing them with this kind of bushings will be a firmer ride..mas matigas normally ang effect nito..some of them will squeak pag nde na apply ng magandang grease...better stick to your oem kasi pricey din ang mga poly bushings...