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is the walbro really much better than a stock M3 pump? how much volume does it flow at 5 bar? from what I've seen, at higher pressure the volume drops off with these cheaper pumps.

I was going to use a bosch 040 but it's huge, and doesn't fit through the tank hole.
 

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Discussion Starter · #3 ·
Depends on which one you buy but the gss342 will support 575 hp at 65psi that's a base of 45lbs with 20lbs of boost if you can make it with less rail pressure, it will support more power. I have 2 running a 2jz through a th400 at 800rwhp so it should be at least 1000 hp at the crank.
 
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