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I have utilized both ESS and MHD flash (ESS stage 1 on 35i and 35is as well as MHD stage 1, 2+ on 35is. Although I did not dyno either of the vehicles on various tunes for a more technical comparison, both stage 1 tunes felt identical. What was different was the price point ($800 vs $150 for stage 1 maps). MHD Flasher is the present as well as the future.
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