You don't "need" a fuel pressure reg but they are a sensible mod if you are going to be pushing the car hard often and upping the power in the future.
I would have thought changing to a 340 l/ph fuel pump would have required a remap?
Injectors can take a higher fuel pump, but again I would have thought a remap would have been required to keep everything fueling how it should?
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Subaru Impreza WRX STi Prodrive Type UK 2002: 
"Tinkered With!" 
Maintained and Modified by Super Jules 
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RM Performance http://www.rmperformance.co.uk
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