Unterstütze Saabi needs a bigger turbo

Hi there! My name is Rares, carguy for many years (too many to remember). Last year, after I damaged my Mazda 3 Bk, I was in need of a car, a pretty rare car so, I found a good deal on a Saab 93 2.0 petrol, b207e (150hp). Now it has a Stage 0.5 (in my opinion, a tuning map and a sport filter, isn't a stage 1) with over 190hp (my butt dyno says 195)
The plan is to install a bigger turbo, to achieve more than 250 hp, maybe 300 without blowing the engine.
I'm still looking for a turbo kit, but most of them are over 600 euro. I will install it by myself and hope I could make a custom exhaust if I learn until then to weld better than now.