Oh ok, yeah I find the bottom end on mine with the 2072 pipe is pretty potent, but thats with a modified engine (GX5R) made to have a large amount of power low in the rev range, I just have to be careful with throttle control.
Have you tried any other pipes on the GO engines, I might even try my brothers REDS 2104 when I get a chance & wouldn't mind trying the newer 2013 GO pipe as well, I think that produces more mid to top end performance but would like to here from someone who has tried it back to back with the 2072.