I don't, mainly as I have never been asked to make them. Typically most GTR owners want 'brand name' parts I have found.
I assume Tony's outlet pipe looked a little 'wrong' to you, it was the only way a turbo that large would fit behind the PS pump without hitting the strut tower. A close up of the exterior of the pipe is interesting, but the inside was perfectly smooth, and it flowed the numbers... Again, not something a GTR owner would generally go for, it's not shiny enough, no matter how practical it is.