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Unless I'm mistaken, we can't buy a new JB4 anymore for the S63, so I guess my question was whether their stage 1 piggyback operates the same way. I get the theory behind stacking and dig it. BMS stage 1 says it adds a fixed 4psi over stock. If "stock" is a flashed tune then it should basically be the same as the JB4 in map 1 right? Perhaps if I start going down this road I need to contact them about it.
My X5M is basically our shop truck and my wife also drives it with our baby in the back seat. I'm trying to do as much to it as I can get away with before having too much adjustability or it becoming so quirky that she could get into trouble.
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