Autocross. Roadracing, or Drag racing I will go turbo everytime. If the engine is set-up with the correct turbo match and and the right set-up BOV lag will not be a problem. Even in autocrossing a good driver will keep the engine in its optimum power band in any corner. One of the important parts of autocrossing is your ET from the start line to the first corner, autocrossers are always trying to make more power to reduce their time.