Draw biased heads can be achieved with various methods,
1) Closed face angel, this would be created during the head manufacturing process, how the hosel is welded to the other portions of the body.
2) internal weighting, this is done by strategically placing weights toward the heeel of the driver this creating a draw biased CG. Some of these weights are internal in the form of a sticky gel inside the head.
3) A more upright lie angle of the driver head,
Grip setup can change the eventual direction, but really depends on what you wish to achieve and what the initial setup of the club.