the narva has a switch box that enables the harness to be used for both positively and negatively switched high beam circuits, hence the added cost but reality is that it is a cheap bit of hardware and the high cost is essentially a convenience charge. though it does have higher quality ribbed insulation tubing compared to the Hella kit.
As i said, I've used the IPF wiring harness and it worked and was easy to install. i'd suggest you do the same if you're not overly electrically minded.
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