Is it physically interfering with anything?
The reason being is it's probably attached to the inertia section, and removing it will likely render the seatbelt useless. The actual charge is not that large, and will be mostly contained in the cast section. The tube is simply a guide tube with a one-way/single shot ratched mechanism, that a bit wire rope gets fired along, with the other end of the rope pulling locking the inertia mechanism and tightening reel by a turn or so.
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If you do fit it intact, don't cut the connector the off. The connector contains a shorting contact, which shorts the two pins together when unplugged to prevent unintentional detonation (a static charge, or even an ohmeter can be enough to detonate them). Just cable tie the connector up and ignore it.