lol. Actually, it's a set of four machined aluminum spacers that are inserted between the factory rubber stoppers on the subframe. By putting them in there, it limits the amount of travel of the subframe and stiffens it up. This makes the rear end a bit more stiff in cornering and eliminates a GREAT deal of wheel-hop that some people experience when drag racing. At $80 it's a great deal for what you get.
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