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Originally Posted by mitch808
The MAP is not an issue really. You can tune around it with a larger MAF and MAF scaling. Of course, again, tuning and finding a tuner capable on this platform I have yet to see. These are common issues on Subaru's, and other turbo charged imports. There is a whole aftermarket using GM MAP sensors, AEM sensors, etc...
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Not sure what your tuning background is but we don't have a MAF on the S63. If you take apart the air box you'll see it's a straight shot to the turbos.
The MAP sensor would be a simple fix if you can rescale. The problem is we are such a small market nobody wants to spend the time scaling our ecu for the higher reading MAP sensors. Do you have the tools or know a tuner that will do it? The ones I spoke to said no thank you as there are a total of 3 of us with upgraded turbos.