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Nick Williams or PTM. That Rev Extreme one looks nice too but not sure on the performance.
The RevX one was designed to eliminate the issues w/the ones that were first on the market 3 years ago & has been proven for over 3 years to be one of the most trouble free & top performing period. Remember, the RevXtreme group is made up of all champion drag racers that compete all over the US and probably have more cummulative track time than any LS based shop in the US (drag strip, not road race) and we use the drag strip to prove our products.