Awesome Mods and results. I'm curious about the stack extension, it makes sense to me and I have read and heard a lot of people talking about the logic of it, but when talking with Craig at Bell Fab he didn't recommend it. This build will not be a reverse flow and he thought that extending the stack didn't create the best results, even though he would if I asked. I figured I'd go with the fabricators recommendation and add something later when experimenting to see the difference. Do you think there is a difference between the stack extension on reverse flow verse standard horizontal offset?