and how do you do it?

 

Here's what he has to say about it in the comments
"There are 5 maps stored on the ECM. Each map has a different rev limiter, I'm switching maps and then holding the gas all the way down to demostrate. That's how I switch maps on the ECM."

He also says in the comments to get with the guys at UpRev so I'm assuming that's where he got it done.