Another option for you power hungry guys is the 928 impeller with the high speed ceramic bearings. Couldn't have recommended them in the past but now they are getting some miles behind them and building a rep.
Will be able to squeeze a good amount more of power out of the setup of you spin it faster on the jackshaft side of things. If your going e85 you will 100% need a rfs. But then might as well take advantage of it all and go with the high speeds if you want to surpass 550.
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