200kw at the wheels or flywheel? There is a big difference. 200kw at the wheels is enough to have some decent fun for sure, but you'll need to run more than std boost and more than likely you'll need some bolt ons and possibly ECU changes. What you have now at 15psi might be close to factory given the age of the engine, so 145kw @ the flywheel. The jump to 200kw at the flywheel or is around a 29% increase over what you have will be almost double if you want it at the wheels.
I had an RX7 S II (PP- atmo) in the early noughts, it had 240hp at the wheels and was good for mid to low 13 sec 1/4 mile ETs all day, so my point is a genuine 200kw (268hp) in an AWD (either ATW or fly) is decent power, but going from the experience of every single person on this forum, you will find that the power bug will bite hard and you'll be looking for more soon!
What I would do if I were in your shoes and genuinely wanted 200kw is:
1. See who has this sort of power already and ask them what mods they have done to achieve it.
2. Calculate the costs of getting to those power goals.
3. Crunch the numbers and see if it's worthwhile doing a 4g63 (2.0ltr) swap instead of throwing $$$ at the 1.8. 4g63 in Evo III spec has 201kw from factory and can handle heaps of punishment. I run my 4g63 at 18psi with 23psi scramble all in stock form with only a crap 3" press bend dump pipe back exhaust and after many months of thrashing it's going strong and pulls hard even with the extra weight being in an RVR.
I'm not saying that what you want is not achievable with the 4g93, I'm just advising that when you want 200kw or more there is more room with a 4g63 and it might be more cost effective in the long run. There are so many of us with 4g63s that parts and goodies come up on a semi regular basis so you will no doubt pick up some bargains to help you along.
