That sucks. Did they replace the injectors as well as the spark plugs? Maybe there is a boost leak or other "hardware" problem, assuming they can install the software correctly after so many tries, but no matter what a crappy situation...
Haven't done much more logging, but I'm still seeing 14 PSI peak with S3 (stock exhaust). If I get an exhaust, I may bump it up to stage 4 and try to get a little more boost.
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