I mentioned earlier this month that my wife and I were buying up a bunch of XMODS accessories being put on clearance at our area RadioShack stores. One of those purchases included an XMODS Evolution Stage 2 Motor Upgrade Kit. With a little help from me, my stepdaughters installed this upgrade on an XMODS Hummer -- and did a few speed tests to see how much difference it made. They found that the upgrade we did resulted in only a moderate increase in speed, but still enough to outrun our other unmodified XMODS the next time we do a little parking lot tag. Get some tips on doing this speed and power upgrade on your Evolution series XMODS in this illustrated tutorial.