Both drivers have regular stock shafts. Loft of new driver is 11.5; old is 10.5. Gained net 10 to 15 yds. I am a 13 handicap with approximately 85 swing speed and play a tight mountain course with a 140 slope rating on front and 129 on back. Swing analysis at several golf shops indicated I needed higher launch angle. Also larger face has resulted in fewer off center poor drives.