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It's your money, you can spend it as you wish. It does not mater if you are racing the car. A lite weight flywheel will help your engine rev quicker. A 2piece seal engine is balanced different than a 1 piece seal engine. You can't interchange the flywheels between a 1 piece and 2 piece seal engine, it will throw the balance off. All those parts can be found easy without going aftermarket. GM had to put a warranty on the parts when the car was new. What kind of warranty do those aftermarket parts carry?
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