Zat_Zuma,
In terms physical data we have not. Just by going by the completely UNscientific "seat of the pants" unfortunately.
We have not compared our mounts to any competitors mounts unfortuantely.
The Urethane model will insulate the noise like the OEM bushings do. The only side affect of the Urethane is the fact that the material is fimer. This will transmite increased vibration into the chassis (driver's compartment).
The Solid models will increase ALL noise significantly. If you want the hardcore track car experience....then the solid is for you. Drivetrain noises, whines, etc. will become much more prevalent. The vibrations and unnoticable rattles will also become much more evident.
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