From what I read, putting inserts in can extend the life of the stock MM's, with little punishment in harshness. I'm pretty sure my mounts are OK at 67k, but wouldn't mind putting $100 in now if it'll keep the stock mounts in shape, and give me some performance to boot.
Is it a dumb idea? In general, I'd like to avoid most vibrations.
Is it a dumb idea? In general, I'd like to avoid most vibrations.