unless your running out of duty on the factory injectors, and you havnt got the option of aftermarket injectors, you shouldnt upgrade the reg, bear in mind that a lot of aftermarket rising rate fuel regs can overstep the limit that the pump can supply and can cause an irregular fuel rail pressure, best advise would be to speak to whomever tunes your car and get their opinion on the best regulator for your application,
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Long live the WRC
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