How tunable is the diesel in the Cooper?

[300bhp/ton]

Just wondering how tunable is the Cooper D's engine? Does anyone sell chips/maps for it and is it worth it??

I know the VW 1.9 Tdi was good for 190-200hp with little effort. Can the little 1.6 be taken to around 160hp and rival a Cooper S??

Thanks

[300bhp/ton]

TTT

Take no one knows then?