Synthetic elastomer means good old fashioned artificial rubber, bonded to metal with heat, like a harmonic balancer or torque-tube driveshaft. Obviously, it'll still be stiffer than stock but, noise transference will be less than Poly, Delrin or Heim styles of connection.
The next step up in stiffness, the classic poly bushing tends to not be too great over time. They can end up cracking and needing replacement in situations that place a lot of varied loads on them.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.4 at 120.64
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP