I thought they really tapered off at higher than stock fuel pressures compared to the walbros. So they might not do that much at higher boost anyway. I'll try to look for a diagram of flow/pressure on a stock compared to aftermarket ones.
EDIT: This diagram is for a stock 3/S VR4 pump which probably outflows the stock dsm pump by a fair amount. At 20psi boost (around 60psi fuel pressure) a single 255 hp will flow almost double. So I'd say twin stock pumps is definitely not worth it.
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