Chassis dyno is a good tool but you can get wadded up in a hurry if you aren't prepared. I added tie down points to my car as well as a couple of O2 bungs that were easy to reach so the car would be easier to get mounted up on the dyno. The chassis dyno works a lot better if you have a manual trans. You'll also want to use a radial street tire and don't be shy about putting some tire pressure in it.