was wondering if anyone here has installed bigger injectors and what the performance gains were?
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An injector swap isn't something you do for more power. An injector swap is a supporting mod that will allow parts that require more fuel than the stock injectors will flow to work properly. If you oversize your injector without the need for it, it will cause you to run rich and hurt power production.

 

at what point do the stock injectors not supply enough fuel? is there any naturally asperated that you would need to up them?
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Not really, at least not short of a major rebuild. If you are worried about it, rest assured that your builder will probably inform you that larger injectors are needed when they start the build. In most cases, larger injectors are used for FI applications which require more fuel under boost to prevent the engine from leaning out. On that note, if you are in a situation where larger injectors are going to be required, please make sure that the stock fuel pump is sufficient as well.

I don't see a list of mods, so I assume that you are probably running stock. If you are looking for a good starting place, I would recommend a Tune and CAI. It will probably deliver the most noticable results for the least amount of money.