When should I upgrade from Streetdampr to Fluidampr?

If your engine is running at high rpm, Fluidampr is the best choice. Fluidampr is also required, if your race sanction body requires the use of an SFI accepted damper. If you are replacing your factory stock damper on a mild street and mild race application, the low cost Streetdampr will work just fine. If the application requires crank trigger ignition, use Fluidampr. A crank trigger wheel will not fit on Streetdampr.