Next, i want to show you my project and ask some few questions about it... I think the photo will talk better 
i dont know how much HP, but it mades 1,5 bar Specs: engine full stock / turbo Gt2056vk / Custom exhaust / intake manifold worked with no vaccum port / modified injection pump / eletric pré fuel pump / 320d intercooler
THIS IS NOT FINNISH
injection pump direct acelarator
And the videos... The wistle sound comes from a hole in Intercooler, is to fix;)
First with NO turbo
http://www.youtube.com/watch?v=nTPeT9wZPMo
first start
http://www.youtube.com/watch?v=n84ck6nKgGA
2ª and 3ª gear.. i olnly have 4 gearbox
http://youtu.be/a3gTt10Y4dg
now the question.. The SD23 or SD25, 5gearbox fix to that engine?