Stock Fuel Pump is usually maxing out at 300-350HP, those gains I belive you will still need the Kenny Bell Boost A Pump. Think over 250HP to 350HP will require the boost-a-pump. Over 350 the systems get converted over to return fuel system (seams like Mustang Fuel system / pump is what is used).
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)