Every thread about all 115 bhp Alfa 147 upgrades will be of great help to you. Just look on the same page your thread is located. You can change the exhaust, maybe change the
camshaft, mount a front mounted intercooler, change the induction, install water/methanol injection, even change the turbo if you want. After most of these steps a proper remap of the software is needed. It's up to you ...