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If someone can help with regards to the stock GTR fuel pressure regulator, when does this item need to be upgraded being produced also does the fuel rail have to change?

I've noticed alot of people using the HKS purple one

I'm considering doing both for my final tune with a major rebuild

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https://www.sau.com.au/forums/topic/142329-stock-railfpr/
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Motor spec?

bit hard to say... but then i see many using it over 370rwkw without an issue, so stock gear cant be too bad :P

Have seen many cars with around the 380rwkw mark use these items for extended periods with no problems... I dunno about an exact ceiling value but I can tell you im confident they will perform up to and around this mark no worries.

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https://www.sau.com.au/forums/topic/142329-stock-railfpr/#findComment-2650034
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