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Actually, I'm going to disagree. Something does happen, but what's up for debate is the severity of that thing. I'll explain.
The issue is the volume of fuel you are putting through the rail at stock pressures. That volume associated with the bigger pump creates a pressure drop across the rail. It's impossible for a stock regulator to fix that.
So what happens is one injector sees more pressure and overfuels that cylinder.
Because of where the regulator is, you won't UNDER-fuel any cylinder, but some will be grossly over-fueled. This will cause carbon buildup at an accelerated rate.
It bothered me enough to get a Wolfkatz rail for my car, even back when I ran 440s.
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