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what year ls1?
first year used a regulator
2nd year& on used a damper on the rail which is not needed and the fuelpump module has a built in regulator on it.
if unsure look under your car @ the fuel filter there will be a T-block that has you main line runnin into and outof it and a line returning to the tank. if you have that then you have a intank reg. and no need for a external.
if planning on running boost than a boost referenced fpr is a good idea
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