I have been running meth in my M5 for 4 years. What controller are you using and is it integrated into the tune or on top of the tune? I control with a JB4 and it runs on top of a BM3 Stage 2 93 tune. 2.5 gallon trunk mounted tank (but there is more space in the M5 so it sits behind the left wheel) with 2 0.8mm nozzles mounted pre throttle body in CSF intercoolers though I injected pre IC for a couple of years.
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