Fullbore, i have PipeMasters on my '81. Stock jetting, OEM air filter and stock air box. No flat spots or stumbling. I ride that bike very hard and have a slight gold hue on the head pipes with a blue tint on one of the pipes. I don't mind the colour. There is somebody here with a black '80 with PipeMasters and pods. Sounds like the ideal combo to me...i hope he chimes in.