Ok I don't own a pd130 I own a pd160 Cupra so not my thread really lol but my Cupra is running 201bhp. But from what I do no there isn't Meny diffrance a between the pd160 and pd130.
One thing people do a lot is get hybrid turbos which are all good but no where near what u should be looking at big turbo conversions would be a lot better.
Hybrid turbos firstly would give about 220bhp max with some very bad boost spikes where as a big turbo would give about 240bhp with smooth power curves.they so cost more than the likes of hybrids but there a lot better plus more reliable as an every day car.
Best things to upgrade for power on pd130
Firstly
Egr delete
Front mount intercooler with solild boost pipes ( no leaks

)
Straight through exhaust system
Custom intake pipe don't waste money on a pd160 intake.
Greenstuff air filter
Custom remap or good stage one should see power figures of about 180bhp
Secondly more power
Uprated clucth becasue it will die at this stage
Bigger brakes more power needs to be able to stop 312mm audi tt are a good choice
Now ready for stage 2 and stage 2+
Big turbo conversion
Remap
Power levels 220bhp ish
Now big power bigger injectors or flerd 120ml flow rate tips
Wmi (water methol injection)
Optional......... custom or uprated inlet manifold and exhaust manifold
Custom remap 250bhp + depending on flow
Hope this helps