I had the complete QBM lower trans mount on my car and the vibrations sucked. I mean, this car isn't a Mazda Miata when it comes to shifting, so what I did was combine the large OEM piece with the small polyurethane piece. And now, I don't have any vibrations at all--this with the QBM strut mod done, albeit on a OEM Volvo upper mount. The car is just butter with this setup, I regret nothing.