I have a 2011 N55 running MHD and currently a 50/50 A/W blend through an AEM Kit. The safety wire is attached to a custom T harness on the wastegate control valve. If I run out of juice the level sensor in the tank trips the safety wire and triggers the wastegate to fully open (limp mode).
I agree with others, it's not spraying all the time so the best thing you can do is media blast and then run meth.
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