I replaced the OEM subframe bushings that had GD spacers to aluminum ones. Totally eliminated the wheel hop I had in 1st and 2nd. And the car got REALLY loud. I replaced the aluminum with delrin and it's quiter but still pretty noisey. Loud enough that almost everyone that gets in my car the first time ask what the noise is. I haven't been in a car with ES urethane so I don't know how those sounds, but if you don't have wheel hop issues stay as close to stock for the noise comfort.