"I knew we would play well. All the guys were up for it," said McBean, 17, who has appeared in two MLS games. "But the result really showed how hard we've been working over the past couple of weeks.
"I think any one of us could step onto to the first-team field and compete and perform out there."
Two of the players the Galaxy used Friday -- forward Edson Buddle and Boyens, a defender -- have played in a World Cup.
The West Division title was the first for the Galaxy, which went 1-6-3 last season.
The West Division is one of three sponsored by the MLS. However the three division winners do not meet to determine an overall champion.