I've learned a lot since this thread and the conclusion is that it's a lottery cos there are many V8 TCU versions and the vehicle's behavior depends much on which V8 TCU was fitted + what kind of engine it has (Eu2 or Eu3) + if it was remapped or not + tyre sizes + weight + driving style, etc, ... i've seen cases when the owner was very pleased with the result(the one i mentioned in this thread), others didnt notice much difference and others said it's worst but as i dont have an auto i didnt make a deep research which TCU is better and for which conditions so i can't recommend anything certain, you'll have to try yourself.... the only certain thing is: if you want the best without specific power tuning you need std dimension tyres, that's a fact.