If it was a full downpipe, option of being divorced or not, and would fit any Garrett style t2 turbine housing (i.e.: t/gt25; 28; 28r; 28rs; 30r) then I think they would have a great product that really no one could complain about. Those us with nice 3” downpipes could just sell them (a nice flooding of the market, but I’m sure they would sell in time); and it would accommodate everyone. ‘Course, that’s asking for a lot and pretty much a miracle. That being said… If they are making just a j-pipe I would be interested if it was a 3” v-band dump, was divorced, and would work with a gt30r. I can easily cut my downpipe and weld in a v-band to match it.
I have an old AMP divorced j-pipe for a GTi-R’s t28 they can look at if it would help in anything said above. Just throwing that out there.