I have had mine for about 6 months / 5k miles. I originally was going to order the Berk HFC, but they were on backorder and z1 suggested theirs. It was less expensive and available.
The quality was as good as you could expect (it looks well-made, nice welds, etc.). I had a shop install them so I can speak to fitment but they said they didn't have any trouble.
On a stock Nismo exhaust it got a tiny bit louder, and added just a bit of rasp. The power difference was immediate and noticeable.
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