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I didn't feel much difference going to UMI solids from the poly clamshell. The trans mount made the bigger difference going poly from the stock rubber, but you will need poly with either of these engine mount options
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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