I went from a maxed out 12mm 215 pump to a 13mm pump. With the 13mm pump set at 500cc's the truck ran way cleaner, spooled quicker and ran a lot stronger than the 12mm. This was s366 over s480 and at the time I still drove it on the street some. I can't describe enough how clean and crisp it ran at part throttle, leaving a stop light compared to what is was.
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