As the title implies I am trying to decide between going with NA Stage 3 or Turbo Stage 4 on my BMW M3 GTR Race Car '01. I've searched the forums and checked out GTVault but I haven't seen any discussion focused on this exact question. What do you guys think?
The NA is better for response in racing, more "grunt", if you will. The Turbo has better top speed though, and when the turbolag ends, the acceleration is very good. I would choose NA.
I would chose NA but the turbo works better on the Nürburgring. But it depends what you need it for so NA or a Turbo works well. There are advantages and disadvantages with both points so it's entirely up to you.