If you are going just full bolt-ons you don't need a fuel pump and you will be fine with the R35 stock injectors. If you start dropping in cams, upping compression, upping displacement, and the like you will want to move up accordingly.
This is also coming from the school of thought with tuning and engine building that you should keep you injector size as close to your power needs as possible; and some do not proscribe to that school of thought. The above bolt-on R35 injectors and stock fuel pump come from 1 year of personal experience running flex-fuel.
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2009 G37X | 326 AWHP | 264 AWTQ
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