I see he's got the Kenne Bell in there, their kits come with a boost-a-pump for the GT500's twin pumps. raising the fuel pressure is all that's needed in that car to deliver up to a little over 800whp. 800whp on race gas is the most they recommend on their kits for that car with everything stock. doubling the fuel pressure can add over 50% more flow to the injector's rating. you get diminishing results after a certain point but it's a good way to add more fuel.
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2009 Mustang GT - Hurst Short Shifter
13.9 @ 100.5mph, 2.1 60' (Density Altitude: 1985 feet)
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