i have a 1989 turbo supra.. has 95k on the car.. 4k ago the bearings were replaced, head re machined, and metal head gasket intalled, every other part still met toyota factory specs. then turbonetics turbo, 3in custom exhost were installed. the car hits its fuel cut off at about 12psi, with the factory fuel pump is it safe for me to install the HKS FCD

if i were you i would get some upgraded fuel goodies really.... if you have a turbonetics turbo def upgrade that fuel
550cc injectors, bigger fuel pump, fuel pressure regulator etc

so basically.. no it's not safe

get those fuel mods then install the fcd and go get dyno'd to ensure that you are getting good a/f mixtures

good luck with your monster :)