I can think of a number of Mk2 golf owners running 300bhp with 1.8t KO4 stock systems they have dropped in (stock block, stock turbo, new DP, injectors etc) running DTA, emerald, Qpeng, or similar. One was running 1.6 bar, 270bhp at the wheels
it runs 225 as standard at stupidly low boost, its only 75bhp away from the target.
anything is possible...its just not worth it in my opinion. poor power delivery and torque curve and a turbo failure waiting to happen.