I have 1/2 gallon thru it, I have tried different pipes I tried a tsias pipe that work killer with the .21 and then I tried a xtm 2 chamber tuned pipe ( stock mammoth pipe). I did have a hot plug in when I was beaking it in but switched to a meduim range plug to try and get a good tune on it. Is the #5 plug you recommend a hot, med, or cold plug. I will try shoteneing the pressure line right now its about 10 to 11 inches. I keep at it.

thanks for the tips