meh, my 33 GTST made 178rwkw with nothing but a frount mount... It was running quite a lot of boost though...
added an ecu, full exhaust, pod filter and gained like 12 kws...
Now it's over 200 with all that shit, but the turbo is pushing out a bar of boost or more...
Every car is different.
don't waste your time with a supercharger, especially if you have a 'minimal budget'. Modifying performance cars has nothing to do with minimal budgets...