These new SFI certified engine balancers are approved for competition, wont crack or come loose under extreme conditions (SC Applications) and will not go out of balance. They feature a sealed outer ring with a captured elastomer dampening ring. They are keyed for performance applications and can be used with a standard crankshaft as well. Priced well below anything else available, this is a great upgrade for any Gen 1-2. $199 while they last. Feel free to call 310-597-6295.