What are the limits of the stock returnless system?
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Somwhere around 700rwhp, the pressure will become unstable due to the regulator being mounted in the fuel tank. Also if forced induction, you will likely want boost reference your fuel pressure to maintain your injector flow.
At this time you should consider a front mount regulator & return line at a minimum.
At this time you should consider a front mount regulator & return line at a minimum.