I think this subject has been discussed countless times, and IMO, doesn't need to be. Other cars, and 3rd gen Camaros, for example, don't have bushings at the subframe points. I don't liken the need for solid bushings to torque, but driving, and a desire to keep the B-pillar from cracking. I went from poly bushings to GW solid, and the difference was immediate. I had a large fire wall crack-gap that closed up immediately and doors were better. I added the CE bolt in connectors later and I noticed an improvement the moment I transitioned from my steep driveway to the street. Neither stage did I ever notice any additional body or street noise/vibration. And at those times, this car was my DD.