sure leg extensions is a great pre exhausted exercise.
barbell back squat, hack squat are good for lower body hypertrophy.
many neglected abduction movement, increasing size adductor and gracilis really give your a much bigger quad looks too.
doing abduction before any wide stand on platform movements. like ultra wide stand on inclined/vertical leg press, sumo squat/Deadlift.
training for a big quad takes more than few exercises, certainly do not neglect this one.
thank me later.