For your exhuast system, as by the sounds of your requirements you need custom made, I would goto Hayward and Scott, as I dont know of any off the shelf manifolds for the 182, saying that, the 182 exhaust manifold is very good, so maybe you would be better off just going decat/sports cat and full system (janspeed decat magnex echaust or hayward and scott full custom) and spending the money you would have spent on the exhaust manifold on work on the inlet manifold (PM BenR for his 2 stage process). As for induction kit, you've hit the nail on the ehad with ITG Maxogen, though shop around, you can get it cheaper than KTR sell it for. Finally ECU, dont goto superchips, with those mods you need a custom map, best bet is an SMT6 piggy back ecu from someone like GDI, this can be mapped specifically to your car and to the mods you have had done.
So if you went with inlet manifold, decat, exhaust, ITG and an smt6 you would probably see 190ish bhp