First - why do you want to upgrade your turbo? If it is wore out then yes do the upgrade. If you are looking for more power (aren't we all) there are ways to get more boost out of your existing turbo. 93 6.5 has a mechanically acuated waste gate. You could increase spring pressure to hold the waste gate from opening so soon. If you decide to do this you need to upgrade the exhaust, pull the snorkel for the air intake(it lives between the inner and outer fender) Turn up your IP and get a set of A pillar gauges. EGT, Boost and tranny temp. Tere is no computer saftey shut downs so you need to live by these gauges. You can search exsisting threads for this info. If you can't find it P.M. me and I'll help you out.
Dave
93 2500 - best truck I ever owned
Sold
98 GMC Sierra 1/2 ton 4X4 EC SB Dark Blue
3"turbo down to 4" back.
Remote PMD
Was S then F code now SSD ECM (used - it was cheap - not my first choice)