Solids r a horrible chioce for street driven cars, I’m runnin poly’s, some vibration, but easy to live with. If I was doin it again, I’d use rubber, & chain or strap it, to keep the motor from torque’n over, an adjustable setup that allows the motor to shake at idle, but tight enough for imediate response to the loud pedal. You’ll have the best of both worlds:D