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I've used both, like both. JB4 can be run in tandem with a flash and still allows fast map switching without reflashing if changing fuel mixtures if that's your thing. MHD is much more for custom tuning and setting a final map IMO which is why I switched over recently.
Track? Better detune, have an upgraded cooling system, or factor in frequent cool down laps and paddock time with either. N54 runs HOT especially when tuned on stock turbos.
Tldr; JB4 still more versatile for the average user, MHD catching up quick.
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