What a man. I think it's worth giving a shout out to such a credible guitarist. I've recently been struck with the RATM bug (again haha), and just listening to his stuff is outstanding. And not as easy to play as one might think. I especially love his approach to guitaring and how he gets the weirdest effects from it, have you seen his pedal board? Its tiny haha.
I think the main pedals he uses is the wah and digitech wah, everything else is bells and whistles.