Hi Fred -
We run in BMW Club Racing H-Stock and can do software, but it can't be a piggyback - we're just waiting for the right time/place to get the Dinan product in along with their oil cooler.
Problem for us is we're already close on weight - without changing out the sunroof. So by the time we do lighter wheels and a different passenger seat, we may not need to worry about swapping the battery.
We had a ball watching our car with no software yet drag racing higher classed cars on the front straight at WSIR.
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