So I have a A4 1.9tdi 130hp and my mechanic said my turbo are in need of replacing or refurbishment. Question is how can I use this opportunity to give my car more oomph in the performance..What combination etc like maybe turbo, mapping, downpipe or decat would give the best results. Also the smaller the cost the better. Although in South Africa your guys over here's knowledge on Audi is amazing!