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Considering the way Terry came about discovering the JB4 works with the S63, it's my understanding that an N63 JB4 can be installed and flashed with S63 firmware...which I have and is floating around on N54Tech.
I've let the GF drive the car alone and I usually put it back to map 0, which then I'm still running a stage 2 tune but at least she's not pushing 21psi...because I know she'll try to lol. If your wife isn't the type to go WOT, then you'd mostly never know otherwise until you're into boost. A tune pushes a few more PSI and boost comes on quicker, making it feel more responsive. Stacked is, dare I say it, almost violent how it goes from subtle cruiser to a higher full boost...15 to 21 is a big jump in this thing.
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