Saw a Citroen/Peugeot 1.5d engine in Micra with turbo

[Theflyingpostman]

I went to the cars show, I saw a Nissan Micra K11 2002 which have 1.5d is the same engine from my Citroën AX 1.5d, but it adds a turbo. I was speaking to bloke who owns this car if he has reduced the compression ratio when fitted a turbo, he said no modified have done on the engine but adjust the fuel mixture on Bosch injector pump has gained to 16bhp with performance exhaust and air filter.
Not only that, but I have looked the compression ratio on my car is 23 to 1 it is very high for have turbo? Would it risk blowing up the head gasket? Because I like to think, have one turbo on my.

[GiveMeABreak]

Can't comment on customisation - it may look the same engine, but could well be different internally.