VERY difficult to get more power low down than you mods you have already. the 2.5 V6 is not renound for big power gains, the mods you already have are the best way forward. after that, the way forward is a supercharger conversion. whole kit to convert it is readily available in america, but its not cheap, and if you were contemplating that, my advice would be take that money, sell the 200, and buy a car that has good tuning capeabilty, because the V6 Duratec doesnt.


as for the boost valve, waste of time, will make matters worse, not better.