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from the 240 world:
"Subframe bushing collars take up slop developed because of old stock rubber subframe bushings, to yield a more responsive suspension and reduced wheel hop on aggressive launches. These 8 piece aluminum collars install above and below each of the four bushings and retain the stock anti-squat geometry, vs. 4 piece spacers that just install on the bottom slightly increasing anti-squat. "
Z1 Subframe Bushing Collars S13
"Subframe bushing collars take up slop developed because of old stock rubber subframe bushings, to yield a more responsive suspension and reduced wheel hop on aggressive launches. These 8 piece aluminum collars install above and below each of the four bushings and retain the stock anti-squat geometry, vs. 4 piece spacers that just install on the bottom slightly increasing anti-squat. "
Z1 Subframe Bushing Collars S13
