OK, there are dual mode dampers for the stock engine. A stock damper is tuned for a specific frequency, but that does not mean it does nothing for the rest of the harmonics. It just does a better job at the tuned freq. Unless you have seriously modified your car (Vortec, turbo, nos, that stuff) the stock damper is a good unit. Obviously the Fisher is more effective if you have built your engine drastically, I say go for it. If you want peace of mind, go for it, if you want 5hp from the underdrive capability, that is an expensive swap.

Just call me Judge.
People suck.
Life begins at 170mph...until that point it is just boring.....