My view-If your not racing would not use %30-As the tuning window on 30% is alot smaller/finer.. If you get the tune wrong on 30% you could damadge the engine badly.. 20+25% are slightly easier if the tune is slightly off the engine is fine.. So if you do go 30% be very carefully.. as its a pickier in the tuning window so to say..
+1 Byron
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