For the price of the GTECH, you might as well go to the track like 10 times and get 6 dyno runs in... No offense but I do not see why anyone would need a product like this. It just gives estimates which really doesn't do much except cause bragging rights that no one is going to believe. I bet it says my car with 300hp and 2.73 gears has less HP than a car with 250hp and 4.10s.