If you are running a stock Turbo then leave your boost at about 10.5-11.0 as the stock turbo can only handle 12psi (and no point running it constantly at full boost).
I've got a '95 S1 which has done 65,000km and purrs like it should. Cat-back exhaust, FMIC, boost controller and a HKS Airpod.
@ 7psi i got 169rwkw
@ 12psi i got 192rwkw
So u could expect similar results from your mods.