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BMS has a G20 M340 for development and said their times improved from mid 12s to high 11s on crappy 91 octane fuel, trap speed gains of 4-5mph. They are waiting to do some E30 runs and then will post everything for comparison along with the logs.
If you're not picking up performance then there is likely a reason so look at your JB4 logs and carefully compare boost, timing, and fueling on map0 (Stock) vs whatever map you're running to see where you are coming up short.
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