Dominic,Thumperdart found out about the flow capaicty of the Fram filters the hard way, he flowed his fuel system with one and then added another one in parellel and pick up almost a 80% increase in ounces in 11 seconds He couldn't fatten the jets up enough to slow the car down before, he almost could jet it up enough after adding the second filter. That was with one of the fabled (I've run in the nines with one of them years ago pumps we all hear about on here Holley blue pumps and regulators ) He switch to one of Holleys newer and bigger pumps and he can now fatten the jetting up enough to slow the car down on power on the chassis dyno But he did have his pinion angle set the right way(CA way) before and after