+1 for shop doing the work or lots more research
there is tons of research in this forum about how to set up the up pipe on sohc ej25 - you dont need the spacer if you shave a tab on the head and your up-pipe cant have a flex section on it if you dont use a spacer. i run a turbo legacy exhaust manifold mated to an hks up pipe and invidia v3 downpipe with stock location wrx/sti turbo and sohc heads....
what crossmember do you have??