a turbo m8 running abour 10-12 lbs boost should hit about 8000 rpm fast then pull its way to 8200 max. anything over 12 lbs boost i have been told the M8T's should pull 8300-8350rpm max... again hit about 8100 fast then grunt its way up to 8300. Less than 10 lbs boost I would imagine 8000-8100 should be the max rpm.