Hi, I have finally had a 3" turbo back exhaust fitted. The vehicle is now far more rapid in it's throttle response and is a pleasure to drive. I have not yet had the chance to ascertain if it has made a difference to fuel economy . Very happy so far.
My 2002 vehicle, New Zealand, new, does not have any of the smog fittings EGR, Cat etc. so I am not breaking any laws.