Hi And welcome to SES
A lot of people on here will be able to help - but I think with most scoobs - a simple remap will certainly give you "some" additional horsepower. A good panel filter, class 7 spark plugs, uprated fuel pump should give you some decent results. Bigger turbo's and intercoolers will start costing ££££.
Sure someone with much more knowledge than myself will be along soon though