There is porting and there is porting. Harvey has done headers for several of us locally and until you experience the difference from just fitting the headers you will not believe it. I got his headers and uppipe and it is the best value for money mod I have had on any car. It was done on an exchange deal so the car was not off the road and swapping them over was only £70. Drpped car off on the way to work and collected it at lunch time.