Traditionally the stage 3 turbo is for the 0-400m time trial if that changes your opinion at all, but an interesting fact is that on the speedster the turbo pressure DROPS with more revs meaning it does less work and you get less power, so it doesn't ruin everything like in other cars, it just provides better run out of corners, but leaves you a sitting duck on the longer straights.
very true, it does leave u a sitting duck in the straights. Trust me I had to shorten the gears to get its top speed to 189-195mph. How about stage 4? Whats it drawbacks besides lag?