You can add bolt-on's still you're blue in the face. Higher flow injectors and fuel pump, TGV deletes, larger intercooler, MBC and/or EBCS, intake, exhaust, external wastegate, etc. The list can go on and on. If you just want to lean on your stock turbo while not setting records, I'd go with a full TBE, panel filter and a hallman MBC. Drive car and enjoy.