I had one on my GLHT for quite a while. Mine was flame spray welded though. Mike @ FM made a kit out of them. Many others before and after made their own.I was blathering over on the Shadow think tank thread about how I feel the different runner lengths keep more heat in 1 and 2 aside from severely limiting their flow. I wish we had a unit like this that was fully cast from the ni-resist. Do you do any daily driving of your car with this setup? I wonder if anyone used one for any significant period of time. It would be cool to find out they survive ok with proper preheat and annealing.