Just wondering if any has put one on a Hahn manifold? Considering a new turbo or just welding up the internal ports.

It shouldn't be to hard to put one on the hahn manifold. Another option is to remove the wastegate door and run the external on the exhaust side of the housing. A lot of 4g63 guys run them like this. Some exhaust housings dont allow this so it could effect the turbo you run if you chose to go this route.

98 Eclipse GS Turbo
Built motor - MS2 - Holset hy35 - Zoom Stg 4 Clutch - 57.5mm TB - ARP Headstuds - Turbonetics wastegate - 3" Turbo back - FMIC - Greddy RZ BOV - Walbro 255 - 650cc Injectors - Fidanza Flywheel - Cobra calipers w/ 13" Rotors - Oil Cooler - DevilsOwn meth injection

1981 Chevy Scottsdale
1987 Nissan 300zx - Chump Car
2001 BMW 325i

I run a external Wastegate. Tial to be exact, works like a charm!