The mounts supposedly help the drivetrain efficiency to some minute degree, but they are also a feeling mod since they make everything firmer and less spongy. Also, my car loves to buck in 1st gear with the stock mounts. I've been told firmer mounts would help reduce that. The stock mounts were only designed for stock power and they do wear out and cause issues like clutch chatter too.
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Slow and low, that is the tempo.
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