On the Energy Core Mission in VB, its really easy for B-Gears, basically what you need is a nice missile, and a fast engine. What you do is speed through the core bombing it, and when you are headed into the corner, turn up till you get to the top of the rock, and B-stop until the missiles hit it. then go back down and bomb it again, this time just going far enough into the canyon so that the missiles explode before hitting you, turn around and repeat.
Hope this helps,
~Ph03nix