The TDi FIAT Sofim engine is a fine power unit. It is already fitted wth an intercooler.
I don't see how more power can be extracted from it easily.
However I have known them not to have the accelerator adjusted correctly. I think they may well be set slack when new to stop delivery drivers killing the motor.
Push the pedal to the floor & then get a.n.other to see if the accelerator shaft lever on the pump has any slack. On one I looked at recently the shaft was only half open. It was the cheapest performance increase the owner could ever have had.
The other point note is that if you have a late pre JTD engine you will probably be suffering that over high top gear.
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