Go to Lingenfelter performance forum they have a flow rate chart for the most popular pumps. I bought the Stewart EMP pump and I'm going to have Lingenfelter re program it to pump more. It $90 to re program. Its the highest flowing pump of the ones they have listed except for the ZR1 which is $900 They even list the prices for some of them. I saw an EMP on E bay for sale.
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