1/ For the grit sound to it you can try saturating the filters with the rectifier, make sure you use a single saw and maybe a sub osc to give it little beef not too much though because you don't it to steal too much power from the original osc.
2/ For that wub wub effect in dubsteb, usually an lfo is used to modulate a low pass filter usually a synced one. In this case it sounds like they've automated the sync rate and the lfo amount so not only it goes from not being modulated at all to being fully modulated, but it speeds up in a synced manner to the track.
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