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like stated usually the eprom is programmed with a specific fpr & injectors in mind. I think the RRFPR was used prior to the days when the eprom was programmed. If it was me I wouldnt do the RRFPR and just try the eprom & possibly injectors. How much boost are you running & does it back off as the RPM's increase?
I would consider adding a downpipe to let the exh flow better
posted by 64.134.3...
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