yow to all speed freaks ,just found out on my ms6 that the sputter cause was due to the fact that i tapped into the vacuum line from the turbo to the turbo boost valve ,to run a vacuum source to my BOV ,i removed vacuum line & route hose back like original setting drove car ran with no sputter or flutter effect while changing gears ,my sputter was mostly felt while going into fourth gear then after that car would run through higher gears fine ,so that is what i found with mine ,don't know if this will help others with same issue i also have cobbs sri ,denso itv22 plugs ,synapse blow off valve running in recirculation mode,performance clutch kit & short shift kit installed ,good luck to all ,peace .
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