Sell your 105 and buy a 135.
Buying a turbo, intercooler, pipes, ECU and many other things will cost a lot more than changing car.
And I'm sure that the engine is not the same, compression ration is lower on turbocharged engine.
Pistons, rods, crankshaft are reinforced on turbo engines. Camshafts are not the same, but for the multiair I don't know this influence, as it is quite different of other traditional engines.