Converter is an 8" ATI Treemaster. This is my first experience with one if these. So far, from what I can tell, it seems to be doing as advertised. The only thing was I had asked for about 4800 flash stall and it's getting right at 5000. I doubt you can guess them much closer than that when you're welding the thing together. You could obviously tighten it up from here but before I did that, I think a 4.10 axle might drop it a tad anyway. And if not, ok too as I need less axle for dropping rpm out the back door. But THAT hinges on whether we're going to run 1/8 mile or quarter mile. Don't need it for 1/8 mile. Decisions, decisions, decisions....