The Pembina Valley Twisters scored four times in the third period and beat the St Boniface Riels 6-2 in their pre-season finale Thursday night in Morris. Graham Leiding had a pair of goals for Pembina Valley while the rest went to Nick Hildebrandt, Corbin Delichte, Brody Mullin and Dylan Ostberg. The Twisters, who won all six pre-season games, will open the 2010-2011 Manitoba Major Junior Hockey League season against the St. Vital Victorias Sunday afternoon in Morris.