i ran a 20g on my 97gsx with a stock 7bolt. heres my experience.
mods: 3in intake with stock mas, TDO6H 20g with 40mm external on a Victory performance 02 housing, front mount kit, 3in exhaust, stock fuel pressure regulator, 255pump rewired, afc, 680s(dont flow much more than 650s) 309awhp on a bone stock 7bolt at 20psi. Just for shits we threw in 5 gallons of race gas at a little less then a quarter tank turned the boost up to 26psi(little bit scary considering i had 90k miles on the motor and stock head studs and gasket) and made 361awhp and 366ftlbs with no audible knock and room left to tune on the afc. based on that i can say that dsmlink is not necessary for such an application. People seem to forget to keep things simple!!!!!!!!
results after having the head off to put in new arp studs and 4layer gasket, had head refreshed (3angle valve job, new seals, new valve springs, cleaning of the ports no real port work)
i installed a HKS 264 intake cam and a 272 exhaust cam. picked up a Magnus intake manifold and used a 1g throttle body
my new 20psi numbers went up to 355awhp a little dissapointed the torque didnt come up much at that boost level only like 5ftlbs of torque increase 301ftlbs but all in all a good setup very streetable. the magnus wasnt too bad for me to install u need to shorten ur ic pipe and get a small honda battery. other than that just relocating the coilpacks and transitor isnt too bad
i wish i still had my 20g best street setup i had. i never got to do race gas with the cams and sheetmetal intake in. if i saw similar gains like i did with the early race gas numbers would have made 400awhp easy
just a little side note about myself. ive been into dsm since 96 when i wasnt even driving yet. Im 24 now and have owned my 97gsx since the middle of 99. ive experimented personally with 6 different turbo setups for the 7bolt T25,T28,14b,16g,20g,60-1 and a very basic setup utilizing a true 20g works the best for sure. youll have a daily driven street car that can turn 11s at the track drive from connecticut to florida and then back again and not have issues.
if u need help let me know i can tell u part for part what i used and give u recommendations