Does anyone have any advice on polyurethane subframe and control arm bushings? I don't want more noise than stock, but a bit tighter is fine. The rubber parts are mostly NLA, so thinking about going polyurethane. Have heard a lot about them, everything from "no more noise than stock" to "feels like solid metal", and I understand there are different grades of them, but can anyone give any advice on experience, brands etc.? Weekend driver, no street racer. I hate noise, but a firm ride is fine.