You don't have to have the purge, but its is good for 1/10th of a second (or is it a 1/100th?) on 1/4 mile, to vent lines of so called "stale gases". Also looks good when doing it (intimidation) but can get expensive if you get purge happy.
So far my installation is going good. That fuel tee, you need to used a hair dryer to help expand the inner plastic liner to get the tee in there without a prob.
But be careful, remember to disconnect battery, relieve the fuel pressure, and watch out how hot you get it.
NX Express import kit 35-50-75 part#: 20923 $465-$600
add-ons:
GenX kit (no purge)$250-$325
GenX2 kit (w/ purge)$300-$450
depending where you buy from.
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