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i hear fuel rail design is good enough nowadays such that "upgrading" will do jack all. i read in a car mag (dont remember which one) that a big power gtr with stupidly large turbos was dynoed with stock and aftermarket fuel rails and there was no difference. the same article also showed a twin turbo v6 camry making good relaible power with stock rails.

i say dont even bother with the injectors unless ur making some very good gains. everything is designed with a factor of safety. in a stock car the injectors would probably never flow more than 70% capacity, leaving you with a fair bit to play with before you need to upgrade. if u only have basic bolt ons, there is no need for injectors but if u go turbo or do a crazy NA build then yes, definately get bigger injectors.
 
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