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I bought one a few years back because I kept breaking the bracket mount weld on my stillen test pipes (ProTip: Stillen Test Pipes are POS). I haven't broken the weld since, so it's doing it's job. Worth it if you can score one under a $100.
NO PERFZ I DONT.ACTUALLY GOT THIS PEICE AS A GIFT FROM MY BRO...JUST NOT SURE IF ITS WORTH PUTTING ON THE CAR,JUST TRYING TO GET SOME UNBIASED OPINIONS!hahahahahahahahahahahaha
I used an engine torque brace on my old RX7 and it proved to be very effective at reducing heavy vibrations. It won't increase engine response but you feel the engine more.
Just install it, can't do any harm. The Z is such an insulated car compared to the older vehicles I'm used to driving, you won't notice any vibrations or harshness from a engine damper. I never got mine to thread together all the way though (the red cap to the cylinder portion), so let me know if you manage to do that.