I installed a FASS last fall, I don't think it is that noisy, from what I hear the later models are some what quieter. I would guess you may have an issue, keep an eye on that pressure gauge.
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99 Cummins 4x4 automatic 4:10gears,magnaflo turbo back, Diablo power puck, K&N filter, dual pillar pod with fuel pressure & trany temp and a fass system .