its crap.... There only for 2 wheel drive cars, pan cars mainley.. the reading you get have no comparison to anything else out there.. so you have to find what is good, then set your baseline.. then hope its right.. all it is , is a different kind of load dyno.. I never liked mine..
HERE IS MY TRADER FEEDBACK ON HOBBYTALK. http://www.hobbytalk.com/bbs1/itrader.php?u=8257