good luck getting a company to do you a one off tubular manifold for the turbo in 133. the last best was pro-speed with ktec in both turbo and standard manifolds and they aint going to touch another one. the engine is a pain to work with turbo wise, might have room in there but the work would have to be done with the engine in and not out making it harder. you've seen the clearing shots with mine, a GT25 should fit but it'll be a pain if you have to replace other parts.
there was a lad on TOC saying he got a final price on a SC kit for the 133 at about 4k, 3k cheaper then what ktec wanted for the turbo kit.
182 injectors would have to be used as well as a new ecu, the stock will not be able to handle it, and your looking at about 1k plus for ecu and loop kit. the standard pistons and engine can take 0.5bar pressure, something like 10-14 psi (not sure on bar to psi conversions but def 0.5bar is max to push) but there are lower compression at 8.0 you can get but no forged conrods as of yet. was quoted a 40 bhp/ft-lb increase
you you've got the cup version should be easy to install SC or even more effective screw or root one but it will have to sit very low if you've got aircon but there is room.
i've been told best results is to get ITB/ECU and pistons to gain same power as turbo/charger route at around the same price and still keep like a rensport n/a car. not sure how the car will handle with that power increase at the wheels a maybe a LSD maybe needed?