The DME can’t handle the turbos even with a flash - need PID control which the JB4 offers. Get the V2. I went through this exact stuff 2-3 years ago :-)
Secondly, to make real power you need meth. 7 gallons E85 is too much. Your setup with meth can make a safe 730-740whp and if you push it even 800whp. I suggest stick to the low-700 range.
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