Yeah, it won't kill the pump. Just make sure you change the fuel filter after switching, and you'll be fine. Get a caspers or racetronix rewire on there as well. A stock pump will supply enough fuel to get you below a 3.0 pulley in most cases.
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Ah ok.
I used a stock fuel pump all the way to a 2.6 with E85 and 42's, but it was leaning out and the pump wasn't cutting it. with the upgraded pump, I'm at 80% duty cycle and that is the highest i want to go. I do feel like i'm the exception to the rule as I live at 7000 feet elevation, so the air is so thin up here that I don't need near as much fuel. I also run water/methanol so I get more fuel headroom from there.
you can get away with not using a tuner with E85, but in my opinion you should use one.