fiat marea mods

[golfiste]

hi my father's car is a fiat marea with a turbo diesel engine.it has 105 bhp and 200 nm of torque.it is a 1.9 liter engine and he 'd like to make some mods like modifying ECU and boost turbo pressure and above all reduce weight cause it is a heavy car nearly 1.5 ton.So if anyone want to help,
i would appreciate a lot

thanks