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Better get bigger turbo if you have your engine and gearbox internals prepared for bigger power.
If not prepared - build the engine for bigger power and then... get a bigger turbo...
of course it's kind of simple answer - but honestly, myself I see no big reason to install NOS etc. in turbo car, especially the street car... maybe for drag racing etc.
the reason alot of people use just a 25 shot is a little extra kick but it ni on eliminates turbo lag eg bigger turbo more=more power but no lag and an extra 25bhp