SFI Dampner for r53 Why?? Engines running higher and higher rpm levels, and there has been a rash of oil pump failures. These failures are a result of 'harmonic vibration' normally caused from high rpm engine operation. The OEM Balancer isnt up to the capability and needs to be upgraded. Thus I am offering the "FluidGel Harmonic Balancer". This type Balancer is SFI rated at 12,500 revs. Is a sealed unit and NEVERS need a rebuild. Thus the advantages of the FluidGel Type. IF you are at 7500 rpm or over, or Race and are at long periords of high rpm, then THIS is for you!! Cost: $275.00 FREE Shipping in the US Thanks Thumper Performance