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I've been running our soon-to-be-released e85 maps on our shop FRS (header only) and the improvement (over 100oct) are substantial. Although not as night and day as comparing it to 91oct. Where the extra octane/cooling really helps the engine is above 6000rpm where the engine can't run ideal ignition advance due to octane limitations. Take that away and the engine really does sing another (much happier) tune!
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