Stage 1Remap
stage 1+ exhaust well removal of back box.
Hard intercooler pipe work or uprated forge pipeing.
That's the route where I have gone.
The next route gets pricey
Stage 2Bigger turbo uprated higher flowing injectors remap
Stage 2+bigger uprated inlet manifold better air filter.
Custom remap.
And a very strong clutch.
All in costs of that would be around 4k jut for parts then labor on top.
But the 4k cost would put u at about 250 bhp plus