2nd gen pump is cheaper, AD/FASS has to be easier to install.
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92' W250, rhino liner bed+cab. Pump bombed: timing 18*, AFC out, #366 spring, New Era 6x18's (finally!), #60 exh springs, 2ndGen piston pump (@18psi), BHAF, HX40, 4" turbo to 6" hoodstack, full gauges, 4" PAC engine brake, onboard air, train horns!