I think it really depends on what u want to do with the car, do u autox or road race the car? If its just a toy you drive around time then its really your call. I lost about 500rpms of spool going to a 20g. And then even more with the holset. I autox and track my car and the holset is not ideal for either, but the power is great to have. I would probably rebuild the 16g and push the hell out of it to make some good power and keep a good spool. It would be a nasty street car.

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