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I was wondering it is possible run 4 rc rsx injectors or greddy rsx injectors and upgraded fuel pump? with out doing return fuel for turbo.

 
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i could be wrong but i would think with a return fuel system you would getter better results, specialy if your boostin

 
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If the aftermarket rsx injectors are the same size as the stock rsx injectors (dimensions, i.e. height) then they should drop right in like the rsx injectors do. However....try not to go too big unless you have fuel management otherwise your car wont idle if the injectors are too large and you can't trim the fuel.

 
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you don;t have to have the return fuel conversion but Im not sure if aftermarket rsx injectors are gonna fit without some modification to the rail.