depends on your interpretation of turbo upgrade... completely new aftermarket or the gte turbo and manifolds
if someone is willing to rebuild urs for next to nothing, see if you can find a gte block and rebuild that, he probly won't know the difference, just a couple of extra holes here n there on the block
get a mhg, arp head studs, ct26 and manifold, ecu, harness, turbo cams, cam position sensor and that's all i can think of right now... it's getting late lol